kottke.org posts about science
According to a recent paper, as little as 12 seconds of video is enough to identify a particular shooter's personal "motion signature".
Here's a way to shake off anonymity - literally. Footage from wearable cameras contains a "motion signature" unique to you. The discovery could identify police wearing body cameras, but also let authorities single out protesters uploading footage, say.
Physics World, the magazine of the Institute of Physics, has named their 2014 Breakthrough of the Year and nine runners-up. The top spot goes to the ESA's Rosetta mission for landing on a comet.
By landing the Philae probe on a distant comet, the Rosetta team has begun a new chapter in our understanding of how the solar system formed and evolved -- and ultimately how life was able to emerge on Earth. As well as looking forward to the fascinating science that will be forthcoming from Rosetta scientists, we also acknowledge the technological tour de force of chasing a comet for 10 years and then placing an advanced laboratory on its surface.
The other nine achievements, which you can click through to read about, are:
Quasar shines a bright light on cosmic web
Neutrinos spotted from Sun's main nuclear reaction
Laser fusion passes milestone
Electrons' magnetic interactions isolated at long last
Disorder sharpens optical-fibre images
Data stored in magnetic holograms
Lasers ignite 'supernovae' in the lab
Quantum data are compressed for the first time
Physicists sound-out acoustic tractor beam
From Quora, an answer to the question "If we pour water on the sun with a bucket as big as the sun, will the sun be extinguished?"
The probable answer is "no." The Sun involves a special type of fire that is able to "burn" water, and so it will just get hotter, and six times brighter.
Water is 89% oxygen BY MASS. And the Sun's overall density is 1.4 times that of water. So if you have a volume of water the VOLUME of the Sun, it will have 1/1.4 = 0.71 times the mass of the Sun, and this mass will be .71*.89 = 63% of a solar mass of oxygen and 8% of a solar mass of hydrogen. The Sun itself is 0.74 solar masses of hydrogen and 0.24 solar masses of helium.
So you end up with a 1.7 solar mass star with composition 48% hydrogen, 37% oxygen, and 14% helium (with 1% heavier elements).
Now, will such a star burn? Yes, but not with the type of proton-proton fusion the Sun uses. A star 1.7 times the mass of the Sun will heat up and burn almost entirely by the CNO fusion cycle, after making some carbon and nitrogen to go along with all the oxygen you've started with. So with CNO fusion and that mass you get a type F0 star with about 1.3 times the radius and 6 times the luminosity of the present Sun, and a temperature somewhat hotter than the Sun (7200 K vs. the Sun's 5800 K). It will be bluish-white, with more UV. That, along with that 6 times heat input, will cause the Earth's biosphere to be fried, and oceans to probably boil.
Well, we probably shouldn't do that then. (via gizmodo)
Whilst roving about Mars, Curiosity has slowly but surely racked up evidence for a past Mars that was warm, wet, and possibly habitable.
John P. Grotzinger of Caltech, the project scientist for the mission, reported at a news conference on Monday that the rover's yearlong trek to Mount Sharp provided strong new evidence that Gale Crater had large lakes, rivers and deltas, on and off, for millions to tens of millions of years. The geology shows that even when the surface water dried up, plenty of water would have remained underground, he said.
Moreover, the team concluded, numerous deltalike and lakelike formations detected by orbiting satellites are almost certainly the dried remains of substantial ancient lakes and deltas. None of this proves that life existed on the planet, but the case for an early Mars that was ripe and ready for life has grown stronger.
"As a science team, Mars is looking very attractive to us as a habitable planet," Dr. Grotzinger said in an interview. "Not just sections of Gale Crater and not just a handful of locations, but at different times around the globe."
See also the interactive 28 Months on Mars.
Update: And right on cue, Curiosity has recorded a two-month-long methane burst on Mars. One explanation for the methane is that it's a waste product of living organisms.
The presence of methane is significant because the gas cannot exist for long. Calculations indicate that sunlight and chemical reactions in the Martian atmosphere would break up the molecules within a few hundred years, so any methane there now must have been created recently.
It could have been created by a geological process known as serpentinization, which requires both heat and liquid water. Or it could be a product of life in the form of microbes known as methanogens, which release methane as a waste product.
Even if the explanation for the methane turns out to be geological, the hydrothermal systems would still be prime locations to search for signs of life.
A shell found in the 1890s was recently found to have what scientists are calling the world's oldest "abstract marking", a 500,000-year-old etching made by Homo erectus, an extinct ancestor of modern humans.
Close inspection under the microscope suggested that the engraving was intentional. The weathering patterns of the grooves, each of which is about 1 centimetre long, show signs of significant ageing, and there are no gaps between turns, indicating that the maker paid attention to detail. He or she probably made the engraving on a fresh shell, and the newly made etching would have resembled white lines on a dark canvas, Joordens' team notes. Sand grains still embedded in the shell were dated to around 500,000 years ago.
It turns out if you break some kinds of slow-growing corals into tiny pieces, these microfragments grow much much faster than usual, even 25-50 times faster.
"Part of the coral had grown over the back side and had attached to the bottom of the aquarium," he said. When he grabbed it, "it broke off and left two or three polyps behind. I thought I just killed those. But oh, well, I moved the puck over."
A week later he happened to glance at the abandoned polyps -- the individual hydra-shaped, genetically identical organisms that make up a coral colony -- on the bottom of the aquarium. "I noticed that those one to three polyps were now five to seven polyps," he said. "They not only had lived -- they had grown and had doubled in size."
It was, he said, "my eureka mistake." He cut a few more polyps from the original colony and placed them on other pucks. "And they grew like crazy. The coral seems to want to repair itself quickly and grow back over its lost ground before something else takes its territory."
Both this and the article about the quickly regenerating corals I posted last month seem to hinge on a realization scientists have had recently about coral: what matters most is the surface area, not the volume. You look at a massive brain coral and you think the whole thing is the organism, but most of it is just a base for the thin layer of stuff coating it that actually matters.
A new analysis of the genomes of two extinct human species (Neanderthals and Denisovans) shows more clearly that they interbred with our species of human, contributing 2-4% of our modern genomes in some cases.
"What it begins to suggest is that we're looking at a Lord of the Rings-type world -- that there were many hominid populations," says Mark Thomas, an evolutionary geneticist at University College London who was at the meeting but was not involved in the work.
But, more interestingly, the analysis also detected the Denisovans also bred with an as-yet-unknown species of humans.
The Denisovan genome indicates that the population got around: Reich said at the meeting that as well as interbreeding with the ancestors of Oceanians, they also bred with Neanderthals and the ancestors of modern humans in China and other parts of East Asia. Most surprisingly, Reich said, the genomes indicate that Denisovans interbred with yet another extinct population of archaic humans that lived in Asia more than 30,000 years ago -- one that is neither human nor Neanderthal.
Is this the first time a new human species has been discovered through DNA evidence alone?
Google Research built an interactive periodic table of the elements where you can see the relative amounts of the elements as found in the human body, in the sea, and, most interestingly, by the number of mentions in books.
If you've ever wondered why the periodic table is shaped the way it is, click on "electrons" under "Shape" and pay attention to the number of electrons in the outer shells in each column of elements. Amazingly, when Dmitri Mendeleev and German chemist Julius Meyer published the first periodic tables in 1869/1870, the elements were organized only by atomic weights and chemical properties; they didn't know what an electron was and certainly weren't aware of quantum shells of electrons. (via @djacobs)
Photographer Ernie Button photographs the dried remains of single malt scotch whiskies, which end up looking like desolate landscapes on distant worlds.
Curious as to how these patterns were formed by some kinds of whiskey but not others, Button reached out to an engineering professor at Princeton.
Dr. Stone's group found that the key difference in whisky is that unlike coffee, it consists of two liquids -- water and ethyl alcohol. The alcohol evaporates more quickly, and as the fraction of water increases, the surface tension of the droplet changes, an effect first noticed in the 19th century by an Italian scientist, Carlo Marangoni. That, in turn, generates complex flows that contribute to the patterns Mr. Button photographed.
"Here, they actually looked at what happens when you change the fluids that are drying," said Dr. Yunker, who is soon heading to the Georgia Institute of Technology as a physics professor, "and they found some very neat effects." (That would be neat in the usual sense of "cool and intriguing" and not as in "I'll have my whisky neat.")
Now this is an ambitious Kickstarter project: Lunar Mission One wants to send an unmanned probe to an unexplored area of the Moon, land on the surface, drill a hole at least 20 meters in depth to analyze geological composition of the Moon, and then drop a time capsule in the hole that will last 1 billion years. That's. Insane.
We're going to use pioneering technology to drill down to a depth of at least 20m -- 10 times deeper than has ever been drilled before -- and potentially as deep as 100m. By doing this, we will access lunar rock dating back up to 4.5 billion years to discover the geological composition of the Moon, the ancient relationship it shares with our planet and the effects of asteroid bombardment. Ultimately, the project will improve scientific understanding of the early solar system, the formation of our planet and the Moon, and the conditions that initiated life on Earth.
The Rosetta mission has opened the way for a new era of pioneering space exploration and demonstrates the public appetite to engage with the secrets of the solar system. We want this to be a truly international mission that everyone everywhere can get involved in, so we are using Kickstarter to finance the next phase of development. This is your chance to be part of Lunar Mission One and to reserve your place in space. Your pledge will reserve you a digital memory box that will be buried in the moon during the mission as part of a 21st Century time capsule.
This is a great way to think about how big the planets of our solar system are: in terms of fruits.
(via boing boing)
A European Space Agency landing craft the size of a washing machine is scheduled to land on a comet tomorrow, November 12, 2014. How cool is that?
Never before has a space mission put a lander on a comet. But the European Space Agency (ESA) plans to change that. Its Rosetta craft has been orbiting comet 67P/Churyumov-Gerasimenko since August and is set to release the washing-machine-sized lander, Philae, on 12 November. This would set in motion a nail-biting seven-hour fall designed to deliver Philae to a landing site called Agilkia on the comet's surface. Philae is programmed to beam data and images back to Earth to help scientists to understand comets, including whether these conglomerations of ice, rock and dust supplied our planet with water and other building blocks of life when they smashed into it billions of years ago.
You can watch the landing live (or here too)...touch down on the comet's surface is scheduled for 11:03 AM EST. Here's a full rundown of the events on landing day. Good luck, Philae!
Update: Randall Munroe of XKCD is live drawing the landing.
Kip Thorne is a theoretical physicist who did some of the first serious work on the possibility of travel through wormholes. Several years ago, he resigned as the Feynman Professor of Theoretical Physics from Caltech in part to make movies. To that end, Thorne acted as Christopher Nolan's science advisor for Interstellar. As a companion to the movie, Thorne wrote a book called The Science of Interstellar.
Yet in The Science of Interstellar, Kip Thorne, the physicist who assisted Nolan on the scientific aspects of Interstellar, shows us that the movie's jaw-dropping events and stunning, never-before-attempted visuals are grounded in real science. Thorne shares his experiences working as the science adviser on the film and then moves on to the science itself. In chapters on wormholes, black holes, interstellar travel, and much more, Thorne's scientific insights -- many of them triggered during the actual scripting and shooting of Interstellar -- describe the physical laws that govern our universe and the truly astounding phenomena that those laws make possible.
Wired has a piece on how Thorne and Nolan worked together on the film. Phil Plait was unimpressed with some of the science in the movie, although he retracted some of his criticism. If you're confused by the science or plot, Slate has a FAQ.
Update: Well, well, the internet's resident Science Movie Curmudgeon Neil deGrasse Tyson actually liked the depiction of science in Interstellar. In particular: "Of the leading characters (all of whom are scientists or engineers) half are women. Just an FYI." (via @thoughtbrain)
Update: What's wrong with "What's Wrong with the Science of Movies About Science?" pieces? Plenty says Matt Singer.
But a movie is not its marketing; regardless of what 'Interstellar''s marketing said, the film itself makes no such assertions about its scientific accuracy. It doesn't open with a disclaimer informing viewers that it's based on true science; in fact, it doesn't open with any sort of disclaimer at all. Nolan never tells us exactly where or when 'Interstellar' is set. It seems like the movie takes place on our Earth in the relatively near future, but that's just a guess. Maybe 'Interstellar' is set a million years after our current civilization ended. Or maybe it's set in an alternate dimension, where the rules of physics as Phil Plait knows them don't strictly apply.
Or maybe 'Interstellar' really is set on our Earth 50 years in the future, and it doesn't matter anyway because 'Interstellar' is a work of fiction. It's particularly strange to see people holding 'Interstellar' up to a high standard of scientific accuracy because the movie is pretty clearly a work of stylized, speculative sci-fi right from the start.
This is a time lapse of the surface of the Sun, constructed of more than 17,000 images taken by the Solar Dynamics Observatory from Oct 14 to Oct 30, 2014. The bright area that starts on the far right is sunspot AR 12192, the largest observed sunspot since 1990.
The sunspot is about 80,000 miles across (as wide as 10 Earths) and it's visible from Earth with the naked eye. Best viewed as large as possible...I bet this looks amazing on the new retina iMac. (via @pageman)
A children's book about space featuring information graphics illustrated by the completely awesome Jennifer Daniel!?
The third in a visually stunning series of information graphics that shows just how interesting and humorous scientific information can be. Complex facts about space are reinterpreted as stylish infographics that astonish, amuse, and inform.
INSTANT PURCHASE. February 2015 cannot come fast enough.
In 2013, a group of researchers published a paper called Collective Motion of Moshers at Heavy Metal Concerts. The paper's abstract reads:
Human collective behavior can vary from calm to panicked depending on social context. Using videos publicly available online, we study the highly energized collective motion of attendees at heavy metal concerts. We find these extreme social gatherings generate similarly extreme behaviors: a disordered gas-like state called a mosh pit and an ordered vortex-like state called a circle pit. Both phenomena are reproduced in flocking simulations demonstrating that human collective behavior is consistent with the predictions of simplified models.
The authors built an interactive mosh pit simulation based on their simplified models. You can try it out right here:
If you believe in gravity, then you know that if you remove air resistance, a bowling ball and a feather will fall at the same rate. But seeing it actually happen, in the world's largest vacuum chamber (122 feet high, 100 feet in diameter), is still a bit shocking.
In the late 1500s, Galileo was the first to show that the acceleration due to the Earth's gravity was independent of mass with his experiment at the Leaning Tower of Pisa, but that pesky air resistance caused some problems. At the end of the Apollo 15 mission, astronaut David Scott dropped a hammer and a feather in the vacuum on the surface of the Moon:
In a rare bit of good news about climate change, it appears that some types of coral have the ability to recover more quickly from trauma caused by rising ocean temperatures (archive).
At Palau in the western Pacific, a survey completed just three years after the 1998 bleaching event showed more coral had recovered on reefs within protected bays and on deep slopes.
Scientists suggest this is because heat and light serve as a double-whammy to coral health and corals that hang out in shady zones will escape the scorching combination, upping the chances that remnants will survive.
Seven years after the bleaching event, some reefs had regained nearly 40 per cent of their corals, with two species of plate-like acroporid coral, A. digitifera and A. hyacinthus, particularly prevalent. "We sampled plating coral colonies there a few years ago and found them to be pool-table size," says Stephen Palumbi, Director of Stanford University's Hopkins Marine Station, in Pacific Grove, California, US.
Today's Google Doodle honors Jonas Salk on what would have been his 100th birthday. Salk developed the first successful polio vaccine in 1955 and was hailed as a hero for it.
On April 12, 1955, Dr. Thomas Francis, Jr., of the University of Michigan, the monitor of the test results, "declared the vaccine to be safe and effective." The announcement was made at the University of Michigan, exactly 10 years to the day after the death of President Roosevelt. Five hundred people, including 150 press, radio, and television reporters, filled the room; 16 television and newsreel cameras stood on a long platform at the back; and 54,000 physicians, sitting in movie theaters across the country, watched the broadcast on closed-circuit television. Eli Lilly and Company paid $250,000 to broadcast the event. Americans turned on their radios to hear the details, department stores set up loudspeakers, and judges suspended trials so that everyone in the courtroom could hear. Europeans listened on the Voice of America. Paul Offit writes about the event:
"The presentation was numbing, but the results were clear: the vaccine worked. Inside the auditorium Americans tearfully and joyfully embraced the results. By the time Thomas Francis stepped down from the podium, church bells were ringing across the country, factories were observing moments of silence, synagogues and churches were holding prayer meetings, and parents and teachers were weeping. One shopkeeper painted a sign on his window: Thank you, Dr. Salk. 'It was as if a war had ended', one observer recalled."
Because of Salk's vaccine and subsequent vaccines, the US has been polio-free since 1979.
Lockheed Martin is in the process of developing a compact fusion reactor they say could revolutionize the world's energy industry.
Dubbed the compact fusion reactor (CFR), the device is conceptually safer, cleaner and more powerful than much larger, current nuclear systems that rely on fission, the process of splitting atoms to release energy. Crucially, by being "compact," Lockheed believes its scalable concept will also be small and practical enough for applications ranging from interplanetary spacecraft and commercial ships to city power stations. It may even revive the concept of large, nuclear-powered aircraft that virtually never require refueling-ideas of which were largely abandoned more than 50 years ago because of the dangers and complexities involved with nuclear fission reactors.
The key difference in Lockheed's approach seems to be the configuration of the magnetic field containing the reaction:
The CFR will avoid these issues by tackling plasma confinement in a radically different way. Instead of constraining the plasma within tubular rings, a series of superconducting coils will generate a new magnetic-field geometry in which the plasma is held within the broader confines of the entire reaction chamber. Superconducting magnets within the coils will generate a magnetic field around the outer border of the chamber. "So for us, instead of a bike tire expanding into air, we have something more like a tube that expands into an ever-stronger wall," McGuire says. The system is therefore regulated by a self-tuning feedback mechanism, whereby the farther out the plasma goes, the stronger the magnetic field pushes back to contain it. The CFR is expected to have a beta limit ratio of one. "We should be able to go to 100% or beyond," he adds.
Charles Seife, who wrote a book about the history of fusion, is skeptical of Lockheed's claims.
This week, Lockheed Martin supposedly managed to achieve a "breakthrough" in nuclear fusion that has gotten a lot of media attention. As Charles Seife points out, it did so "without having built a prototype device that, you know, fuses things on an appreciable scale. It's a stunning assertion, even by fusion-research standards. But a quick look at the defense contractor's ambitious plan-a working reactor in five years-already shows the dream fraying around the edges. A year and a half ago, the company promised that fusion was four years away, meaning that the schedule is already slipping. Negative one years of progress in 20 months is, sadly, business as usual for fusion. At this rate, it'll take Lockheed Martin at least a decade before the natural endpoint: desperately spinning victory out of an underwhelming result generated by a machine whose performance comes nowhere near predictions-and which brings us no closer to actually generating energy from a fusion reaction."
This is fun...Aatish Bhatia maps out the forces and motions involved in doing an ollie on a skateboard.
It's a neat piece of science art, and it also tells us something interesting. The arrows show us that the force on the skateboard is constantly changing, both in magnitude as well as in direction. Now the force of gravity obviously isn't changing, so the reason that these force arrows are shrinking and growing and tumbling around is that the skater is changing how their feet pushes and pulls against the board. By applying a variable force that changes both in strength and direction, they're steering the board.
Gorgeous videos of chemical reactions (precipitation, bubbling, crystallization, etc.). I think the metal displacement reaction video is my favorite:
The sound made by the Krakatoa volcanic eruption in 1883 was so loud it ruptured eardrums of people 40 miles away, travelled around the world four times, and was clearly heard 3,000 miles away.
Think, for a moment, just how crazy this is. If you're in Boston and someone tells you that they heard a sound coming from New York City, you're probably going to give them a funny look. But Boston is a mere 200 miles from New York. What we're talking about here is like being in Boston and clearly hearing a noise coming from Dublin, Ireland. Travelling at the speed of sound (766 miles or 1,233 kilometers per hour), it takes a noise about 4 hours to cover that distance. This is the most distant sound that has ever been heard in recorded history.
A much much smaller eruption occurred recently in Papua New Guinea. From the video, you can get a tiny sense of the sonic damage unleashed by Krakatoa:
Holy smoking Toledos indeed. On Reddit, a user details how loud a Saturn V rocket is and what the effects would be at different distances. At very close range, the sound from the Saturn V measures an incredible 220 db, loud enough to melt concrete just from the sound.
At 500 meters, 155 db you would experience painful, violent shaking in your entire body, you would feel compressed, as though deep underwater. Your vision would blur, breathing would be very difficult, your eardrums are obviously a lost cause, even with advanced active noise cancelling protection you could experience permanent damage. This is the sort of sound level aircraft mechanics sometimes experience for short periods of time. Almost twice as "loud" as putting your ear up to the exhaust of a formula 1 car. The air temperature would drop significantly, perhaps 10-25 degrees F, becoming suddenly cold because of the air being so violently stretched and moved.
Even at three miles away, the sound is loud enough to cause permanent hearing damage. But that's nothing compared to the Krakatoa sound. The Saturn V sound is ~170 db at 100 meters away while the Krakatoa explosion was that loud 100 miles away! What happens at 170 db?
...you would be unable to breathe or likely see at all from the sound pressure, glass would shatter, fog would be generated as the water in the air dropped out of suspension in the pressure waves, your house at this distance would have a roughly 50% chance of being torn apart from sound pressure alone. Military stun grenades reach this volume for a split second... if they are placed up to your face. Survival chance from sound alone, minimal, you would certainly experience permanent deafness but probably also organ damage.
The word "loud" is inadequate to describe how loud that is. (thx, david)
Every year, evolutionary biologist and professor David Barash gives his students The Talk about how evolution and religion do and do not get along.
It's irresponsible to teach biology without evolution, and yet many students worry about reconciling their beliefs with evolutionary science. Just as many Americans don't grasp the fact that evolution is not merely a "theory," but the underpinning of all biological science, a substantial minority of my students are troubled to discover that their beliefs conflict with the course material.
Until recently, I had pretty much ignored such discomfort, assuming that it was their problem, not mine. Teaching biology without evolution would be like teaching chemistry without molecules, or physics without mass and energy. But instead of students' growing more comfortable with the tension between evolution and religion over time, the opposite seems to have happened. Thus, The Talk.
This is the sort of thing Barash talks about:
The more we know of evolution, the more unavoidable is the conclusion that living things, including human beings, are produced by a natural, totally amoral process, with no indication of a benevolent, controlling creator.
Eleanor Lutz has a degree in molecular biology, works as a designer, and loves to combine the two interests by making these wonderful information graphics on her site, Tabletop Whale. Her most recent post is an animated graphic showing how several animals (birds, bats, insects) move their wings while flying.
I love love love Lutz's animated chart of North American butterflies. So playful!
There are only four posts on the site so far, but she's done other stuff as well; this woodcut map for instance. Prints are available...I'm getting one of the butterflies for sure.
Give me even the simplest gravity simulator and I will play with it for many many minutes. Or hours. Or days. (Send help!)
This looks like a time lapse, but it's not. It's just a straight-up gorgeous video of the aurora borealis filmed in Yellowknife, Northwest Territories, Canada.
It is real time motion! NOT time-lapse. Brighter the Aurora, faster the movement.
(via the kid should see this)
Erik Vance on why real working archaeologists don't care for Indiana Jones.
"Oh God," he groans, "Don't even go there. Indiana Jones is not an archeologist."
It's not surprising that academics -- hell bent on taking the fun out of everything -- would hate our beloved and iconic movie version of them. But Canuto is no killjoy. His ironic tone and acerbic wit seem honed by long boring days in the sun. So I bite. I quickly learn that there's a good reason why most every archeologist on Earth hates Indy. And that they might have a point. Because Jones isn't an archeologist at all.
"That first scene, where he's in the temple and he's replacing that statue with a bag of sand -- that's what looters do," Canuto says, grinning. "[The temple builders] are using these amazing mechanisms of engineering and all he wants to do is steal the stupid gold statue."
Makes you wonder if Jones was one of the Raiders referred to in the title of the first movie. (via @riondotnu)
As part of a course he was teaching, a biologist sent away for a genetic testing kit from 23andMe for himself and his parents. When he went looking for other relatives on the service (which is now an automatic opt-out feature), he discovered he had a half-brother his dad had not told his family about.
At first, I was thinking this is the coolest genetics story, my own personal genetics story. I wasn't particularly upset about it initially, until the rest of the family found out. Their reaction was different. Years of repressed memories and emotions uncorked and resulted in tumultuous times that have torn my nuclear family apart. My parents divorced. No one is talking to my dad. We're not anywhere close to being healed yet and I don't know how long it will take to put the pieces back together.
After this discovery was made, I went back to 23andMe and talked to them. I said, "I'm not sure all your customers realize that when they participate in your family finder program, what they're participating in what are essentially really advanced paternity tests." People find out that their parents aren't who they think they are. They have nearly a million people in the database. If there happens to be anyone in there you're related to, they'll find your match. This is a solid science.
I know a family in which one of the children is adopted and they haven't told her. Which is crazy...she's gonna find out eventually (through something like 23andMe or because of some medical emergency or test) and go totally berzerk.
There's a new king of the dinosaurs: Dreadnoughtus schrani. A skeleton of the species was unearthed in Argentina in 2005 and the results of the recently released analysis show this Dreadnoughtus was 85 feet long, weighed around 65 tons, and had a powerful "weaponized tail". The kicker? It was not yet an adult and still growing when it died.
While other giants from Patagonia are known from a handful of bones, almost half of the Dreadnoughtus skeleton has been recovered. What's more, the fossilised bones are in such good condition -- even revealing where muscles attached -- that the skeleton could provide unprecedented insights into the biology, movement and evolution of the group of huge plant-eating dinosaurs it belonged to, called the titanosaurian sauropods.
By comparison, an Apatosaurus (née Brontosaurus) is ~75 feet long and weighed 22 tons while a Boeing 737-900 weights around 50 tons. Here's some more background on the Dreadnoughtus and a video showing some of the fossils:
Hmm, this is interesting. Recent studies suggest that food allergies may be caused by the absense of certain intestinal bacteria...in part due to increased use of antibiotics in very young children.
Food allergies have increased about 50% in children since 1997. There are various theories explaining why. One is that the 21st century lifestyle, which includes a diet very different from our ancestors', lots of antibiotic use, and even a rise in cesarean section deliveries, has profoundly changed the makeup of microbes in the gut of many people in developed countries. For example, the average child in the United States has taken three courses of antibiotics by the time he or she is 2 years old, says Martin Blaser, an infectious disease specialist and microbiologist at New York University in New York City. (See here for more on the reach of microbiome research these days.)
Cathryn Nagler, an immunologist at the University of Chicago in Illinois, has spent years probing links between the immune system, intestinal bacteria, and the onset of allergies. Back in 2004, she and her colleagues reported that wiping out gut bacteria in mice led to food allergies. Since then, Nagler has continued trying to understand which bacteria offer allergy protection and how they accomplish that.
Spanning from comets in the south to the termination shock zone in the northern part of the country, The Sweden Solar System is a scale model of the solar system that spans the entire country of Sweden, the largest such model in the world.
The Sun is represented by the Ericsson Globe in Stockholm, the largest hemispherical building in the world. The inner planets can also be found in Stockholm but the outer planets are situated northward in other cities along the Baltic Sea.
Today's brain-melter: Every Insanely Mystifying Paradox in Physics. It's all there, from the Greisen-Zatsepin-Kuzmin limit to quantum immortality to, of course, the tachyonic antitelephone.
A tachyonic antitelephone is a hypothetical device in theoretical physics that could be used to send signals into one's own past. Albert Einstein in 1907 presented a thought experiment of how faster-than-light signals can lead to a paradox of causality, which was described by Einstein and Arnold Sommerfeld in 1910 as a means "to telegraph into the past".
If you emerge with your brain intact, at the very least, you'll have lost a couple of hours to the list.
Oh man, this is great. A Spacecraft For All is an interactive video about the ISEE-3 Reboot Project, in which a group of scientists working out of an old McDonald's crowdfunded an effort to communicate with a nearly forgotten satellite launched by NASA in 1978 to observe the Sun and chase a comet. After the intro, click on "See the Journey"...it's well worth your time if you're at all interested in space or science.
For instance, did you know there exists several points between the Earth and the Sun at which a satellite can orbit around, enabling spacecraft to stay more or less in the same spot for observation purposes? So cool!
The latest word on Homo floresiensis, the potential new species of hobbit-like humans discovered ten years ago in Indonesia, concerns a pair of papers which argue the single specimen found is actually a regular human with Down syndrome.
Now, the debate has reignited with two new papers published this week by a team of researchers from Penn State and other institutions. In one of those papers, they argue that the Flores skull is not a new species, but instead represents an ancient person with Down syndrome.
The researchers also point out, in the second paper, that the original report on the bones seemed to have exaggerated the skull's diminutive size. Cranial measurements and features, along with shorter thigh bones, the team found, all correspond with modern manifestations of Down syndrome. "The difference is significant, and the revised figure falls in the range predicted for a modern human with Down syndrome from the same geographic region," they say in a statement.
Physicist Andy Howell recently gave a talk about the science of Star Wars and wrote up a summary of it for Ain't It Cool News. Topics covered include binary star systems, droids, the Death Star, and lightsabers:
Of course, we still don't know how to make a lightsaber. One big problem is confining plasma (if that is even what it is), into some tube. But a bigger problem is the amount of energy required. We can actually calculate this from clues in the movies!
In Episode I, Qui-Gon jabs his lightsaber into a door, and melts part of it. That's just basic physics! To melt something, you have to raise its temperature to the melting point, and you can calculate how much energy that takes using the specific heat capacity of a material.
MIT's Franz-Josef Ulm has taken to analyzing the structure of cities as if they were molecular materials like glass or crystal.
With colleagues, Ulm began analyzing cities the way you'd analyze a material, looking at factors such as the arrangement of buildings, each building's center of mass, and how they're ordered around each other. They concluded that cities could be grouped into categories: Boston's structure, for example, looks a lot like an "amorphous liquid." Seattle is another liquid, and so is Los Angeles. Chicago, which was designed on a grid, looks like glass, he says; New York resembles a highly ordered crystal.
I love this. It's like Jane Jacobs + the materials science research I did in college.
So far, Ulm says, the work has two potential applications. First, it could help predict and mitigate urban heat island effects, the fact that cities tend to be several degrees warmer than their surrounding areas-a phenomenon that has a major impact on energy use. (His research on how this relates to structure is currently undergoing peer review.) Second, he says that cities' molecular order (or disorder) may also affect their vulnerability to the kinds of catastrophic weather events that are becoming more frequent thanks to climate change.
(via 5 intriguing things)
According to data collected by a European satellite array, the Earth's magnetic field is shifting and weakening at a greater pace than previously thought. One of the reasons for the shift might be that the magnetic North and South poles are swapping positions.
Scientists already know that magnetic north shifts. Once every few hundred thousand years the magnetic poles flip so that a compass would point south instead of north. While changes in magnetic field strength are part of this normal flipping cycle, data from Swarm have shown the field is starting to weaken faster than in the past. Previously, researchers estimated the field was weakening about 5 percent per century, but the new data revealed the field is actually weakening at 5 percent per decade, or 10 times faster than thought. As such, rather than the full flip occurring in about 2,000 years, as was predicted, the new data suggest it could happen sooner.
You can read up on geomagnetic reversals on Wikipedia. A short sampling:
These periods [of polarity] are called chrons. The time spans of chrons are randomly distributed with most being between 0.1 and 1 million years with an average of 450,000 years. Most reversals are estimated to take between 1,000 and 10,000 years. The latest one, the Brunhes-Matuyama reversal, occurred 780,000 years ago. A brief complete reversal, known as the Laschamp event, occurred only 41,000 years ago during the last glacial period. That reversal lasted only about 440 years with the actual change of polarity lasting around 250 years. During this change the strength of the magnetic field dropped to 5% of its present strength.
Earlier today I asked my Twitter followers for recommendations for "really good" biographies about scientists. I gave Genius (James Gleick's bio of Richard Feynman) and Cleopatra, A Life (not about a scientist but was super interesting and well-written) as examples of what I was looking for. You can see the responses here and I've pulled out a few of the most interesting ones below:
- Isaac Newton by James Gleick. Gleick wrote the aforementioned Genius and Chaos, another favorite of mine. I tried to read The Information last year after many glowing recommendations from friends but couldn't get into it. Someone suggested Never at Rest is a superior Newton bio.
- The Man Who Loved Only Numbers by Paul Hoffman. I've read this biography of mathematician Paul Erdos; highly recommended.
- Galileo's Daughter by Dava Sobel. I've never read anything by Sobel; I'll have to rectify that.
- Einstein: His Life and Universe by Walter Isaacson. I enjoyed his problematic Jobs biography and I notice that he's written one on Ben Franklin as well.
- Alan Turing: The Enigma by Andrew Hodges.
- American Prometheus by Kai Bird and Martin Sherwin. Bio of J. Robert Oppenheimer, leader of the Manhattan Project. See also: The Making of the Atomic Bomb, one of my favorite books ever.
- Everything and More by David Foster Wallace. I've heard Wallace was bit handwavy with the math in this one, but I still enjoyed it.
- Newton and the Counterfeiter by Thomas Levenson. Newton was a detective?
- The Philosophical Breakfast Club by Laura Snyder. Four-way bio of a group of school friends (Charles Babbage, John Herschel, William Whewell, and Richard Jones) who changed the world.
- The Reluctant Mr. Darwin by David Quammen. How Charles Darwin devised his theory of evolution and then sat on it for years is one of science's most fascinating stories.
- T. rex and the Crater of Doom by Walter Alvarez. Not a biography of a person but of a theory: that a meteor impact 65 million years ago caused the extinction of the dinosaurs.
- Walt Disney by Neal Gabler. Disney isn't a scientist, but when you ask for book recommendations and Steven Johnson tells you to read something, it goes on the list.
- The Man Who Knew Infinity by Robert Kanigel. Bio of brilliant Indian mathematician Srinivasa Ramanujan.
- Edge of Objectivity by Charles Gillispie. A biography of modern science published in 1966, all but out of print at this point unfortunately.
- Galileo at Work by Stillman Drake.
- The Age of Wonder by Richard Holmes.
And many more here. Thanks to everyone who suggested books.
Update: Because this came up on Twitter, some biographies specifically about women in science: The Immortal Life of Henrietta Lacks, Hedy's Folly, On a Farther Shore, Marie Curie: A Life, A Feeling for the Organism, Rosalind Franklin: The Dark Lady of DNA, Jane Goodall: The Woman Who Redefined Man, and Radioactive.
Great post on the Fermi Paradox, aka if there are so many potential intelligent civilizations out there in the universe (possibly 10 quadrillion of them), why haven't we heard from anyone?
Possibility 5) There's only one instance of higher-intelligent life -- a "superpredator" civilization (like humans are here on Earth) -- who is far more advanced than everyone else and keeps it that way by exterminating any intelligent civilization once they get past a certain level. This would suck. The way it might work is that it's an inefficient use of resources to exterminate all emerging intelligences, maybe because most die out on their own. But past a certain point, the super beings make their move -- because to them, an emerging intelligent species becomes like a virus as it starts to grow and spread. This theory suggests that whoever was the first in the galaxy to reach intelligence won, and now no one else has a chance. This would explain the lack of activity out there because it would keep the number of super-intelligent civilizations to just one.
Aatish Bhatia noticed a plant in his backyard whose leaves naturally repelled water. He took a sample to a friend who had access to a high-speed camera and an electron microscope to investigate what made the leaves so hydrophobic.
But how does a leaf become superhydrophobic? The trick to this, Janine explained, is that the water isn't really sitting on the surface. A superhydrophobic surface is a little like a bed of nails. The nails touch the water, but there are gaps in between them. So there's fewer points of contact, which means the surface can't tug on the water as much, and so the drop stays round.
The leaf is so water repellant that drops of water bounce right off of it:
In the New Yorker, Michael Specter writes generally about the malleability of memory and specifically about Daniela Schiller's research on disassociating people's memories from the feelings they have about them. Simply recalling a memory can change it, and Schiller has found evidence that process can be used to remove the feelings of stress, anxiety, and fear associated with certain memories.
Even so, Schiller entered her field at a fortunate moment. After decades of struggle, scientists had begun to tease out the complex molecular interactions that permit us to form, store, and recall many different types of memories. In 2004, the year Schiller received her doctorate in cognitive neuroscience, from Tel Aviv University, she was awarded a Fulbright fellowship and joined the laboratory of Elizabeth Phelps, at New York University. Phelps and her colleague Joseph LeDoux are among the nation's leading investigators of the neural systems involved in learning, emotion, and memory. By coincidence, that was also the year that the film "Eternal Sunshine of the Spotless Mind" was released; it explores what happens when two people choose to have all their memories of each other erased. In real life, it's not possible to pluck a single recollection from our brains without destroying others, and Schiller has no desire to do that. She and a growing number of her colleagues have a more ambitious goal: to find a way to rewrite our darkest memories.
"I want to disentangle painful emotion from the memory it is associated with," she said. "Then somebody could recall a terrible trauma, like those my father obviously endured, without the terror that makes it so disabling. You would still have the memory, but not the overwhelming fear attached to it. That would be far more exciting than anything that happens in a movie." Before coming to New York, Schiller had heard -- incorrectly, as it turned out -- that the idea for "Eternal Sunshine" originated in LeDoux's lab. It seemed like science fiction and, for the most part, it was. As many neuroscientists were aware, though, the plot also contained more than a hint of truth.
The black hole at the center of the Milky Way galaxy is estimated to have a mass of 4 million Suns. The largest black hole astronomers have found so far has a mass of 18 billion solar masses, or more than 4000 times as massive as the Milky Way's.
Around 3.5 billion light-years away, this galaxy is estimated to contain the largest black hole presently known, at 18 billion solar masses. (Although, the error bars for this one and NGC 1277's overlap substantially.) But the most spectacular part of this galaxy -- and why we're able to learn so much about it's central region -- is because there's a 100 million Solar mass black hole (that's 25 times larger than the one at the Milky Way's core) that's orbiting the even larger one!
Also, the largest know galaxy in the Universe is IC 1101, with a mass of 100 trillion solar masses.
A group led by Dr. Robert Costanza has calculated the value of the world's ecosystems...the group's most recent estimate puts the yearly value at $142.7 trillion.
"I think this is a very important piece of science," said Douglas J. McCauley of the University of California, Santa Barbara. That's particularly high praise coming from Dr. McCauley, who has been a scathing critic of Dr. Costanza's attempt to put price tags on ecosystem services.
"This paper reads to me like an annual financial report for Planet Earth," Dr. McCauley said. "We learn whether the dollar value of Earth's major assets have gone up or down."
The group last calculated this value back in 1997 and it rose sharply over the past 17 years, even as those natural habitats are disappearing. This line from the article stunned me:
Dr. Costanza and his colleagues estimate that the world's reefs shrank from 240,000 square miles in 1997 to 108,000 in 2011.
Coral reefs shrank by more than half over the past 17 years...I had no idea the reef situation was that bad. Jesus.
A proposal by geochemist Ellen Kooijman for a minifigure set of female scientists has won Lego's Winter 2014 Review. The set, called "Research Institute," is on track to be released by Lego Ideas in August 2014, more than two years after a campaign that took off with huge support from the internet.
Kooijman designed twelve figures in total, plus accessories. Lego will tweak the final designs and hasn't announced the specific characters or total number that will be included. Kooijman's proposed set includes an astronomer, a paleontologist, and a chemist:
Me, I'm a fan of the robotics engineer (pictured below, right, with a falconer and geologist):
Lego already has one female scientist minifigure, released just last fall (after Koojiman's original proposal). She's a chemist/theoretician, with the typical
glasses (safety glasses! according to materials scientist Deb Chachra), pocket protector, and laboratory flasks. But scientists have all kinds of tools and look all sorts of different ways, even broader than Kooijman's all-yellow/caucasian team with generic Lego hair. ("Ideally, Lego would use some 'rare' face and hair designs if they were to produce a set," she writes.)
Besides, go back and look at the composition of some of Lego's other sets to see if it could use more than one female scientist. Minifigure Series 1 had sixteen characters, with the two women being "Cheerleader" and "Nurse." The "Scientist" just came out in Series 11, along with "Grandma," [ok fine] "Pretzel Girl," [really?] "Diner Waitress," [ugh!] and the admittedly awesome "Lady Robot," who loves to party. "Some day she might decide she's ready to stop partying...but not yet!" Go ahead, be gone with it, Lady Robot.
Update: The retail version of the Lego Research Institute has arrived! It's Kooijman's original trio of paleontologist, astronomer, and chemist, with tweaked designs and accessories. Here's a picture:
It is sad to see Gwyneth Paltrow promoting pseduoscience hucksters like Masaru Emoto in her very popular Goop newsletter. It begins:
I am fascinated by the growing science behind the energy of consciousness and its effects on matter. I have long had Dr. Emoto's coffee table book on how negativity changes the structure of water, how the molecules behave differently depending on the words or music being expressed around it.
And later on in the letter, Dr. Habib Sadeghi continues:
Japanese scientist, Masaru Emoto performed some of the most fascinating experiments on the effect that words have on energy in the 1990's. When frozen, water that's free from all impurities will form beautiful ice crystals that look exactly like snowflakes under a microscope. Water that's polluted, or has additives like fluoride, will freeze without forming crystals. In his experiments, Emoto poured pure water into vials labeled with negative phrases like "I hate you" or "fear." After 24 hours, the water was frozen, and no longer crystallized under the microscope: It yielded gray, misshapen clumps instead of beautiful lace-like crystals. In contrast, Emoto placed labels that said things like "I Love You," or "Peace" on vials of polluted water, and after 24 hours, they produced gleaming, perfectly hexagonal crystals. Emoto's experiments proved that energy generated by positive or negative words can actually change the physical structure of an object.
Riiiight. Paltrow should stick to recipes, fashion, and workouts and leave the science to people who actually understand it lest she wander into Jenny McCarthy territory. There's nothing wrong with asserting that thinking positively will improve your life, but connecting it with quantum physics and the like, without rigorous scientific proof, is dangerous and stupid.
Steven Johnson has been working on a six-part series for PBS called How We Got to Now. (There's a companion book as well.) The series is due in October but the trailer dropped today:
And here's a snippet of one of the episodes about railway time. I'm quite looking forward to this series; Johnson and I cover similar ground in our work with similar sensibilities. I'm always cribbing stuff from his writing and using his frameworks to think things through and just from the trailer, I counted at least three things I've covered on kottke.org in the past: Hedy Lamarr, urban sanitation, and Jacbo Riis (not to mention all sorts of stuff about time).
There are a couple of different ways you can construct a stable solar system with a maximum number of habitable worlds. One includes 36 habitable worlds in a single solar system.
We can fit the orbits of four gas giants in the habitable zone (in 3:2 resonances). Each of those can have up to five potentially habitable moons. Plus, the orbit of each gas giant can also fit an Earth-sized planet both 60 degrees in front and 60 degrees behind the giant planet's orbit (on Trojan orbits). Or each could be a binary Earth! What is nice about this setup is that the worlds can have any size in our chosen range. It doesn't matter for the stability.
Let's add it up. One gas giant per orbit. Five large moons per gas giant. Plus, two binary Earths per orbit. That makes 9 habitable worlds per orbit. We have four orbits in the habitable zone. That makes 36 habitable worlds in this system!
If there wasn't life on Mars before, there might be now. Before NASA sent Curiosity to Mars, it was thoroughly cleaned of all traces of contaminants. But swabs of rover's surfaces taken before it was sent to Mars have revealed 377 different strains of bacteria that potentially could have made the trip. Some of them may have even survived.
A study that identified 377 strains found that a surprising number resist extreme temperatures and damage caused by ultraviolet-C radiation, the most potentially harmful type. The results, presented today at the annual meeting of the American Society for Microbiology, are a first step towards elucidating how certain bacteria might survive decontamination and space flight.
If the Moon orbited the Earth at the same distance as the International Space Station, it might look a little something like this:
At that distance, the Moon would cover half the sky and take about five minutes to cross the sky. Of course, as Phil Plait notes, if the Moon were that close, tidal forces would result in complete chaos for everyone involved.
There would be global floods as a tidal wave kilometers high sweeps around the world every 90 minutes (due to the Moon's closer, faster orbit), scouring clean everything in its path. The Earth itself would also be stretched up and down, so there would be apocalyptic earthquakes, not to mention huge internal heating of the Earth and subsequent volcanism. I'd think that the oceans might even boil away due to the enormous heat released from the Earth's interior, so at least that spares you the flood... but replaces water with lava. Yay?
Jupiter's Great Red Spot is becoming more of a Medium Red Spot. The gas giant's signature beauty mark was recently measured by the Hubble as spanning 10,250 miles across its widest point, down from a high of 25,500 miles across.
Historic observations as far back as the late 1800s  gauged this turbulent spot to span about 41 000 kilometres at its widest point -- wide enough to fit three Earths comfortably side by side. In 1979 and 1980 the NASA Voyager fly-bys measured the spot at a shrunken 23 335 kilometres across. Now, Hubble has spied this feature to be smaller than ever before.
"Recent Hubble Space Telescope observations confirm that the spot is now just under 16 500 kilometres across, the smallest diameter we've ever measured," said Amy Simon of NASA's Goddard Space Flight Center in Maryland, USA.
Amateur observations starting in 2012 revealed a noticeable increase in the spot's shrinkage rate. The spot's "waistline" is getting smaller by just under 1000 kilometres per year. The cause of this shrinkage is not yet known.
Clive Thompson recently saw the moons of Jupiter with his own eyes and has a moment.
I saw one huge, bright dot, with three other tiny pinpoints of light nearby, all lined up in a row (just like the image at the top of this story). Holy moses, I realized; that's no star. That's Jupiter! And those are the moons of Jupiter!
I'm a science journalist and a space buff, and I grew up oohing and aahing over the pictures of Jupiter sent back by various NASA space probes. But I'd never owned a telescope, and never done much stargazing other than looking up in the night unaided. In my 45 years I'd never directly observed Jupiter and its moons myself.
So I freaked out. In a good way! It was a curiously intense existential moment.
For my birthday when I was seven or eight, my dad bought me a telescope. (It was a Jason telescope; didn't everyone have a telescope named after them?) We lived in the country in the middle of nowhere where it was nice and dark, so over the next few years, we looked at all sorts of celestial objects through that telescope. Craters on the Moon, the moons of Jupiter, Mars, and even sunspots on the Sun with the aid of some filters. But the thing that really got me, that provided me with my own version of Thompson's "curiously intense existential moment", was seeing the rings of Saturn through a telescope.
We had heard from PBS's Jack Horkheimer, the Star Hustler, that Saturn and its rings would be visible and he showed pictures of what it would look like, something like this:
But seeing that with your own eyes through a telescope was a different thing entirely. Those tiny blurry rings, visible from millions of miles away. What a thrill! It's one of my favorite memories.
For the first time, scientists have created a living cell with DNA containing more than just the familiar A, T, C, and G units.
Hailed as a breakthrough by other scientists, the work is a step towards the synthesis of cells able to churn out drugs and other useful molecules. It also raises the possibility that cells could one day be engineered without any of the four DNA bases used by all organisms on Earth.
"What we have now is a living cell that literally stores increased genetic information," says Floyd Romesberg, a chemical biologist at the Scripps Research Institute in La Jolla, California, who led the 15-year effort.
So instead of just using the GATTACA alphabet, scientists may eventually gain the use of an alphabet containing dozens or even hundreds or thousands of different letters. Potentially powerful stuff.
How to Build a Time Machine is a documentary about two men on separate quests to build their own time machines. Here's a teaser trailer:
Ronald Mallett's reason for his search for a way to travel through time is quite poignant...he shared his story in a book and on an episode of This American Life back in 2007. (via ★interesting)
According to the National Climate Assessment, climate change has already affected the US in significant ways. This map from the NY Times shows the change in temperatures from around the country, specifically the "1991-2012 average temperature compared with 1901-1960 average".
Among the report's findings? As I've noted before, weather is getting weirder and more bursty, not just hotter.
One of the report's most striking findings concerned the rising frequency of torrential rains. Scientists have expected this effect for decades because more water is evaporating from a warming ocean surface, and the warmer atmosphere is able to hold the excess vapor, which then falls as rain or snow. But even the leading experts have been surprised by the scope of the change.
The report found that the eastern half of the country is receiving more precipitation in general. And over the past half-century, the proportion of precipitation that is falling in very heavy rain events has jumped by 71 percent in the Northeast, by 37 percent in the Midwest and by 27 percent in the South, the report found.
Nonlinear systems, man.
The elements located in the upper reaches of the periodic table are notable for their short half-lives, the amount of time during which half the mass of an element will decay into lighter elements (and other stuff). For instance, the longest lived isotope of fermium (#100) has a half-life of just over 100 days. More typical is bohrium (#107)...its half-life is only 61 seconds. The elements with the highest numbers have half-lives measured in milliseconds...the half-life of ununoctium (#118) is only 0.89 milliseconds.
So why do chemists and physicists keep looking for heavier and heavier elements if they are increasingly short-lived (and therefore not that useful)? Because they suspect some heavier elements will be relatively stable. Let's take a journey to the picturesque island of stability.
In nuclear physics, the island of stability is a set of as-yet undiscovered heavier isotopes of transuranium elements which are theorized to be much more stable than some of those closer in atomic number to uranium. Specifically, they are expected to have radioactive decay half-lives of minutes or days, with "some optimists" expecting half-lives of millions of years.
Super Planet Crash is half game, half planetary simulator in which you try to cram as much orbital mass into your solar system without making any of your planets zing off beyond the Kuiper belt. You get bonus points for crowding planets together and locating planets in the star's habitability zone. Warning: I got lost in this for at least an hour the other day.
Ruh-roh. Remember the news last month about the detection of gravitational waves would have allowed scientists to see all the way back to the Big Bang? Well, that result may be in jeopardy. The problem? Dust on the lens. Well, not on the lens exactly:
An imprint left on ancient cosmic light that was attributed to ripples in spacetime -- and hailed by some as the discovery of the century -- may have been caused by ashes from an exploding star.
In the most extreme scenario, the finding could suggest that what looked like a groundbreaking result was only a false alarm. Another possibility is that the stellar ashes could help bring the result in line with other cosmic observations. We should know which it is later this year, when researchers report new results from the European Space Agency's Planck satellite.
You may also remember the video of physicist Andrei Linde being told about the result, which seemed to confirm a theory that had been his life's work. I don't think I want to see the video of Linde being told of this stellar ashes business. Although Linde is more than aware that this is how science works...you have to go where observation takes you. (via @daveg)
The US Navy is working on technology to convert seawater into fuel to power unmodified combustion engines. They recently tested the fuel (successfully!) in a replica P-51 and hope to make it commerically viable.
Navy researchers at the U.S. Naval Research Laboratory (NRL), Materials Science and Technology Division, demonstrated proof-of-concept of novel NRL technologies developed for the recovery of carbon dioxide (CO2) and hydrogen (H2) from seawater and conversion to a liquid hydrocarbon fuel.
Fueled by a liquid hydrocarbon -- a component of NRL's novel gas-to-liquid (GTL) process that uses CO2 and H2 as feedstock -- the research team demonstrated sustained flight of a radio-controlled (RC) P-51 replica of the legendary Red Tail Squadron, powered by an off-the-shelf (OTS) and unmodified two-stroke internal combustion engine.
Using an innovative and proprietary NRL electrolytic cation exchange module (E-CEM), both dissolved and bound CO2 are removed from seawater at 92 percent efficiency by re-equilibrating carbonate and bicarbonate to CO2 and simultaneously producing H2. The gases are then converted to liquid hydrocarbons by a metal catalyst in a reactor system.
"In close collaboration with the Office of Naval Research P38 Naval Reserve program, NRL has developed a game-changing technology for extracting, simultaneously, CO2 and H2 from seawater," said Dr. Heather Willauer, NRL research chemist. "This is the first time technology of this nature has been demonstrated with the potential for transition, from the laboratory, to full-scale commercial implementation."
Discover has more, in slightly more accessible language.
After many days of analysis by scientists and internet sleuths alike, it's likely that the thing pictured whizzing by the skydiver in this video is not a meteorite but a plain old rock that got packed in with his parachute. Phil Plait reports:
I actually became convinced last night, when BA Tweep Helge Bjorkhaug sent me a link to a slowed-down version of the video. Immediately before the rock flies past, I saw a second piece of debris just to the right of the skydiver's parachute strap. It was in several frames, and clearly real.
So yeah, bummer, not a meteorite. But as Plait notes, that's how science works.
That's how you get to the truth, folks. Open inquiry, honest investigation, and acceptance of the line of evidence no matter where it leads.
Researchers at Stanford have observed that foraging harvester ants act like TCP/IP packets, so much so that they're calling the ants' behavior "the anternet".
Transmission Control Protocol, or TCP, is an algorithm that manages data congestion on the Internet, and as such was integral in allowing the early web to scale up from a few dozen nodes to the billions in use today. Here's how it works: As a source, A, transfers a file to a destination, B, the file is broken into numbered packets. When B receives each packet, it sends an acknowledgment, or an ack, to A, that the packet arrived.
This feedback loop allows TCP to run congestion avoidance: If acks return at a slower rate than the data was sent out, that indicates that there is little bandwidth available, and the source throttles data transmission down accordingly. If acks return quickly, the source boosts its transmission speed. The process determines how much bandwidth is available and throttles data transmission accordingly.
It turns out that harvester ants (Pogonomyrmex barbatus) behave nearly the same way when searching for food. Gordon has found that the rate at which harvester ants -- which forage for seeds as individuals -- leave the nest to search for food corresponds to food availability.
A forager won't return to the nest until it finds food. If seeds are plentiful, foragers return faster, and more ants leave the nest to forage. If, however, ants begin returning empty handed, the search is slowed, and perhaps called off.
The reboot of Cosmos has been solid but not spectacular so far, but the second episode contains as solid and clear an explanation of evolution as I've ever seen.
Even if evolution clashes with your world view, this is worth watching if only to understand what you're aligned against (per Bret Victor's advice). The third episode airs on Fox tonight and is about the creation of the scientific method.
I love this video. Love love love. Chao-Lin Kuo surprises Andrei Linde and his wife with the news that gravitational waves were detected, proving Linde's theory of an inflationary universe.
Love love love. (via @stevenstrogatz)
Update: Many people have asked what Kuo is saying to Linde on the doorstep. Let's start with "5 sigma". The statistical measure of standard deviation (represented by the Greek letter sigma) is an indication of how sure scientists are of their results. (It has a more technical meaning than that, but we're not taking a statistics course here.) A "5 sigma" level of standard deviation indicates 99.99994% certainty of the result...or a 0.00006% chance of a statistical fluctuation. That's a 1 in 3.5 million chance. This is the standard particle physicists use for declaring the discovery of a new particle.
The "point-2" is a bit more difficult to explain. Sean Carroll defines r as "the ratio of gravitational waves to density perturbations" as measured by the BICEP2 experiment, the telescope used to make these measurements. What BICEP2 found was an r value of 0.2:
From the brief explanation of the science behind the BICEP2 experiment:
According to the theory of Inflation, the Universe underwent a violent and rapid expansion at only 10^-35 seconds after the Big Bang, making the horizon size much larger, and allowing the space to become flat. Confirmation of Inflation would be an amazing feat in observational Cosmology. Inflation during the first moments of time produced a Cosmic Gravitational-Wave Background (CGB), which in turn imprinted a faint but unique signature in the polarization of the CMB. Since gravitational waves are by nature tensor fluctuations, the polarization signature that the CGB stamps onto the CMB has a curl component (called "B-mode" polarization). In contrast, scalar density fluctuations at the surface of last scattering only contribute a curl-free (or "E-mode") polarization component to the CMB which was first detected by the DASI experiment at the South Pole.
The big deal with BICEP2 is the ability to accurately detect the B-mode polarization for the first time. r is the ratio between these two different types of polarization, E-mode & B-mode. Any result for r > 0 indicates the presence of B-mode polarization, which, according to the theory, was caused by gravitational waves at the time of inflation. So, that's basically what Kuo is on about.
Update: The Atlantic's Megan Garber spoke to Stanford's science information officer about how the video came about.
We didn't do any re-takes. The goal was for it to be a really natural thing. We did ask him to tell us what he was feeling and what the research means. But what you see in the video is just very off-the-cuff and raw. Part of it was, we went there not even knowing if we'd be able to use or keep anything that we did. It was just as likely that he would have been emotional in a way that he didn't want us to share, or that his wife didn't. So we went into it with no guarantee-we knew we'd be able to shoot, but didn't know if we'd be able use it. So we're thankful that they agreed to let us do that.
Finally a viral video that's genuine and not staged or reality TV'd.
This is huge: physicists have detected gravitational waves that harken back to the beginning of the universe, when it was "a trillionth of a trillionth of a trillionth of a second old". The discovery goes a long way toward proving the inflation theory of how the universe formed.
Reaching back across 13.8 billion years to the first sliver of cosmic time with telescopes at the South Pole, a team of astronomers led by John M. Kovac of the Harvard-Smithsonian Center for Astrophysics detected ripples in the fabric of space-time -- so-called gravitational waves -- the signature of a universe being wrenched violently apart when it was roughly a trillionth of a trillionth of a trillionth of a second old. They are the long-sought smoking-gun evidence of inflation, proof, Dr. Kovac and his colleagues say, that Dr. Guth was correct.
Inflation has been the workhorse of cosmology for 35 years, though many, including Dr. Guth, wondered whether it could ever be proved.
If corroborated, Dr. Kovac's work will stand as a landmark in science comparable to the recent discovery of dark energy pushing the universe apart, or of the Big Bang itself. It would open vast realms of time and space and energy to science and speculation.
Confirming inflation would mean that the universe we see, extending 14 billion light-years in space with its hundreds of billions of galaxies, is only an infinitesimal patch in a larger cosmos whose extent, architecture and fate are unknowable. Moreover, beyond our own universe there might be an endless number of other universes bubbling into frothy eternity, like a pot of pasta water boiling over.
If the results are confirmed, Guth will undoubtably win the Nobel in Physics for this soon. Phil Plait at Bad Astronomy has more on the discovery.
Update: This video of Chao-Lin Kuo (one of the principle investigators on this experiment) telling physicist Andrei Linde (a leading inflation theorist) about the result is just outstanding.
Fantastic...Randall Munroe is turning his What If? web series into a book. Munroe explains:
As I've sifted through the letters submitted to What If every week, I've occasionally set aside particularly neat questions that I wanted to spend a little more time on. This book features my answers to those questions, along with revised and updated versions of some of my favorite articles from the site. (I'm also including my personal list of the weirdest questions people have submitted.)
Update: What If? the book is now out. Phil Plait has a rave review.
Look, I answer questions for a living, too, and Randall is really, really good at this. He finds weird little scientific ways to answer the questions, but it's his extrapolations that kill me. I laughed a lot reading this book. Even better: I learned stuff reading this book. And you will too.
Last year (spoilers!), CERN confirmed the discovery of the Higgs boson. Physicist-turned-filmmaker Mark Levinson has made a film about the search for the so-called God Particle. Particle Fever follows a group of scientists through the process of discovery and the construction of the mega-machine that discovered the Higgs, the Large Hadron Collider. Here's a trailer:
Two additional data points: the movie is holding a 95% rating on Rotten Tomatoes and legendary sound designer and editor Walter Murch edited the film. Particle Fever is showing at Film Forum in New York until March 20. (thx, james)
The heath hen was once so plentiful in New England that servants bargained with employers not to be served heath hen for food more than two or three days a week. Due to over-hunting, the heath hen went extinct in 1932. But recently, a film of the bird made circa 1918 was discovered and digitized. The Boston Globe has a short clip of the film.
"I had heard about this film through various channels off and on through the years. It had gotten to the point where it was almost apocryphal in my mind" said Petersen, director of the Massachusetts Important Bird Areas program for Mass Audubon. "Nobody knew where it was, nobody had ever seen it, but I was aware it existed. It was like the holy grail."
No one seems to quite remember the date, but some years ago two canisters containing brittle, aging film that was at risk of spontaneous combustion were found stored at the state's Division of Fisheries and Wildlife. Aging tape with the words "heath hen" was its only label. One canister was sent off to the Smithsonian Institution, recalled Ellie Horwitz, who discovered the film sometime in the middle of her 34-year tenure at the agency. The other canister presented a dilemma because the film was in such terrible condition it might disintegrate.
"It was iffy whether the film could be viewed. And if it could be viewed, chances were we could view it one time, and the question is what are you going to do in that one time," said Horwitz, who retired in 2011. "We had one shot at it; we thought the thing to do was to digitize it."
Ok quiet down, we're going to science right now. (That's right, I verbed "science".) If you take a long chain of beads, put them in a jar, and then throw one end of the bead chain out, the rest of the beads will follow *and* this bead fountain will magically rise up into the air over the lip of the glass.
As the guy's face in the video shows, this is deeply perplexing. For an explanation, slow motion video, and a demonstration of a preposterously high chain fountain, check this video from the NY Times out:
The fountain, said Dr. Biggins, which he had never seen before the video, was "surprisingly complicated." The chain was moving faster than gravity would account for, and they realized that something had to be pushing the chain up from the container in which it was held.
A key to understanding the phenomenon, Dr. Biggins said, is that mathematically, a chain can be thought of as a series of connected rods.
When you pick up one end of a rod, he said, two things happen. One end goes up, and the other end goes down, or tries to. But if the downward force is stopped by the pile of chain beneath it, there is a kind of kickback, and the rod, or link, is pushed upward. That is what makes the chain rise.
A group of marine biologists that has been recently studying mesopelagic fish ("fish that live between 100 and 1000m below the surface") believes that 95% of fish biomass is unknown to humans. Marine dark matter. The problem lies with how fish have traditionally been counted and the enhanced visual and pressure senses of these fish.
He says most mesopelagic species tend to feed near the surface at night, and move to deeper layers in the daytime to avoid birds.
They have large eyes to see in the dim light, and also enhanced pressure-sensitivity.
"They are able to detect nets from at least five metres and avoid them," he says.
"Because the fish are very skilled at avoiding nets, every previous attempt to quantify them in terms of biomass that fishing nets have delivered are very low estimates.
"So instead of different nets what we used were acoustics... sonar and echo sounders."
A not-so-difficult prediction to make is that humans will find a way to catch these wary creatures, we'll eat most of them, and then we'll be back to where we are now: the world's oceans running low on fish. (via @daveg)
Nice visualization of the solar system; the Moon is one pixel across and everything else is scaled to that, including the distances between planets. Get ready to scroll. A lot.
It would be neat to do this with a plutonium atom or something. Related: typographically speaking, what's the point size of the Moon?
Raffi Khatchadourian's long piece on the construction of the International Thermonuclear Experimental Reactor (ITER) is at once fascinating (for science reasons) and depressing (for political/bureaucratic reasons). Fusion reactors hold incredible promise:
But if it is truly possible to bottle up a star, and to do so economically, the technology could solve the world's energy problems for the next thirty million years, and help save the planet from environmental catastrophe. Hydrogen, a primordial element, is the most abundant atom in the universe, a potential fuel that poses little risk of scarcity. Eventually, physicists hope, commercial reactors modelled on iter will be built, too-generating terawatts of power with no carbon, virtually no pollution, and scant radioactive waste. The reactor would run on no more than seawater and lithium. It would never melt down. It would realize a yearning, as old as the story of Prometheus, to bring the light of the heavens to Earth, and bend it to humanity's will. iter, in Latin, means "the way."
But ITER is a collaborative effort between 35 different countries, which means the project is political, slow, and expensive.
For the machine's creators, this process-sparking and controlling a self-sustaining synthetic star-will be the culmination of decades of preparation, billions of dollars' worth of investment, and immeasurable ingenuity, misdirection, recalibration, infighting, heartache, and ridicule. Few engineering feats can compare, in scale, in technical complexity, in ambition or hubris. Even the iter organization, a makeshift scientific United Nations, assembled eight years ago to construct the machine, is unprecedented. Thirty-five countries, representing more than half the world's population, are invested in the project, which is so complex to finance that it requires its own currency: the iter Unit of Account.
No one knows iter's true cost, which may be incalculable, but estimates have been rising steadily, and a conservative figure rests at twenty billion dollars -- a sum that makes iter the most expensive scientific instrument on Earth.
I wonder what the project would look like if, say, Google or Apple were to take the reins instead. In that context, it's only $20 billion to build a tiny Sun on the Earth. Facebook just paid $19 billion for WhatsApp, Apple has a whopping $158.8 billion in cash, and Google & Microsoft both have more than $50 billion in cash. Google in particular, which is making a self-driving car and has been buying up robots by the company-full recently, might want their own tiny star.
But back to reality, the circumstances of ITER's international construction consortium reminded me of the building of The Machine in Carl Sagan's Contact. In the book, the countries of the world work together to make a machine of unknown function from plans beamed to them from an alien intelligence, which results in the development of several new lucrative life-enhancing technologies and generally unites humanity. In Sagan's view, that's the power of science. Hopefully the ITER can work through its difficulties to achieve something similar.
Richard Lenski and his team of researchers utilize a clever technique to observe and study evolution of bacteria in realtime. Periodically freezing a sample of the bacteria every few generations allows them to go back in time to study particular traits and to pinpoint when differences occur.
After 30,000 generations, researchers noticed something strange. One population had evolved the ability to use a different carbon-based molecule in the solution, called citrate, as a power source.
Researchers wondered whether it was the result of a rare, single mutation, or a more complex change involving a series of mutations over generations. To find out, one of Lenski's postdocs, Zachary Blount, took some of the frozen cells and grew them in a culture lacking glucose, with citrate as the only potential food source.
After testing 10 trillion ancestral cells from early generations, he got no growth. But when he tested cells from the 20,000th generation on, he began to get results, eventually finding 19 mutants that could use citrate as a power source. The results showed that the citrate-eating mutation was most likely not the result of a single mutation, but one enabled by multiple changes over 20,000 generations.
According to an article in The Journal of the American Medical Association, the obesity rate of American 2- to 5-year-old children has dropped from 14% in 2004 to 8% in 2012.
Children now consume fewer calories from sugary beverages than they did in 1999. More women are breast-feeding, which can lead to a healthier range of weight gain for young children. Federal researchers have also chronicled a drop in overall calories for children in the past decade, down by 7 percent for boys and 4 percent for girls, but health experts said those declines were too small to make much difference.
Barry M. Popkin, a researcher at the University of North Carolina at Chapel Hill who has tracked American food purchases in a large data project, said families with children had been buying lower-calorie foods over the past decade, a pattern he said was unrelated to the economic downturn.
He credited those habits, and changes in the federally funded Special Supplemental Nutrition Program for Women, Infants and Children, for the decline in obesity among young children. The program, which subsidizes food for low-income women, reduced funding for fruit juices, cheese and eggs and increased it for whole fruits and vegetables.
Kevin Drum calls the drop "baffling".
NASA announced the discovery of 719 new planets today. That brings the tally of known planets in our universe to almost 1800. 20 years ago, that number was not more than 15 (including the nine planets orbiting the Sun). Here's a rough timeline of the dramatically increasing pace of planetary discovery:
4.54 billion BCE-1700: 6
2006: -1 [for Pluto :( ]
Last year, Jonathan Corum made an infographic of the sizes and orbits of the 190 confirmed planets discovered at that point by the Kepler mission. I hope the Times updates it with this recent batch.
Huzzah! Long unavailable (or at least not widely available), Errol Morris' documentary film on Stephen Hawking and his work, A Brief History of Time, is now available for rent or purchase on iTunes. Or if you can wait a little bit, there's a Criterion Blu-ray edition coming out in mid-March. Bonus: score by Philip Glass!
And if you want a sense of how weird, and how fraught, the relationship between science, politics, and commerce is in our modern world, then there's really no better place to go.
In The Daily Beast Michael Schulson provides a alternate view on Whole Foods: America's Temple of Pseudoscience. (The first time I read this, I nearly spit out my probiotic-infused kombucha, kale, quinoa, coconut water shake.)
Related to my post on the frequency of humanity is this post on XKCD on the various frequencies of events, from human births to dog bites to stolen bicycles.
There are too many camels in the Bible. Evidence suggests they were domesticated in Israel centuries after the events in Genesis took place.
Camels probably had little or no role in the lives of such early Jewish patriarchs as Abraham, Jacob and Joseph, who lived in the first half of the second millennium B.C., and yet stories about them mention these domesticated pack animals more than 20 times. Genesis 24, for example, tells of Abraham's servant going by camel on a mission to find a wife for Isaac.
These anachronisms are telling evidence that the Bible was written or edited long after the events it narrates and is not always reliable as verifiable history. These camel stories "do not encapsulate memories from the second millennium," said Noam Mizrahi, an Israeli biblical scholar, "but should be viewed as back-projections from a much later period."
Dr. Mizrahi likened the practice to a historical account of medieval events that veers off to a description of "how people in the Middle Ages used semitrailers in order to transport goods from one European kingdom to another."
Update: Added "in Israel" to clarify the camel domestication timeline...they were domesticated much earlier in the Arabian Peninsula.
Archaeologists have established that camels were probably domesticated in the Arabian Peninsula for use as pack animals sometime towards the end of the 2nd millennium BCE. In the southern Levant, where Israel is located, the oldest known domesticated camel bones are from the Aravah Valley, which runs along the Israeli-Jordanian border from the Dead Sea to the Red Sea and was an ancient center of copper production. At a 2009 dig, Dr. Ben-Yosef dated an Aravah Valley copper smelting camp where the domesticated camel bones were found to the 11th to 9th century BCE.
About 250 million years ago, Earth suffered its fifth (and worst) mass extinction event. Nearly seventy percent of land species disappeared. And they got off easy compared to marine species. Are we headed for another mass extinction on Earth? I'm not ready to break that news. But something unusual is definitely going on and extinction rates seem to be speeding up. Here's an interesting chat with Elizabeth Kolbert, author of The Sixth Extinction.
The worst mass extinction of all time came about 250 million years ago [the Permian-Triassic extinction event]. There's a pretty good consensus there that this was caused by a huge volcanic event that went on for a long time and released a lot of carbon-dioxide into the atmosphere. That is pretty ominous considering that we are releasing a lot of CO2 into the atmosphere and people increasingly are drawing parallels between the two events.
What would happen if a tiny black hole the size of a marble were placed at the center of the Earth? Rest assured, the Earth won't completely be swallowed up by the black hole but that's really the only good news to offer.
First of all, not all of the Earth would simply be sucked into the black hole. When the matter near the black hole begins to fall into the black hole, it will be compressed to a very high density that will cause it to be heated to very high temperatures. These high temperatures will cause gamma rays, X-rays, and other radiation to heat up the other matter falling in to the black hole. The net effect will be that there will be a strong outward pressure on the outer layers of the Earth that will first slow down their fall and will eventually ionize and push the outer layers away from the black hole. So some inner portion of the core will fall into the black hole, but the outer layers, including the crust and all of us, would be vaporized to a high temperature plasma and blown into space.
This would be a gigantic explosion -- a significant fraction of the rest of the mass of the Earth matter that actually fell into the black hole will be converted into energy.
FYI, that marble-sized black hole would have about the same mass as the Earth. Not that they exist, mind you. Maybe, maybe not. Blackish holes? Dark grey holes? Anyway, really heavy.
This is nutty...by chance, a group of archaeologists found what are believed to be the oldest known human footprints outside of Africa on a beach in England. The footprints are an estimated 800,000 years old and are now completely gone. The tide that uncovered them washed them away in less than a month.
The footprints have been described as "one of the most important discoveries, if not the most important discovery that has been made on [Britain's] shores," by Dr Nick Ashton of the British Museum.
"It will rewrite our understanding of the early human occupation of Britain and indeed of Europe," he told BBC News.
The markings were first indentified in May last year during a low tide. Rough seas had eroded the sandy beach to reveal a series of elongated hollows.
The other day, Bill Nye debated Ken Ham about evolution and creationism. At the event, Matt Stopera asked self-identifying creationists to write question/notes to those who "believe" in evolution. Here's one:
Phil Plait of Bad Astronomy responded to each of the 22 notes/questions from the creationists. Here's his answer to the comment above:
I agree; it is amazing! I've written about this many times. But we know that complexity can arise naturally through the laws of physics. It doesn't take very complex rules to create huge diversity. Look at poker; a simple set of rules creates a game that has so many combinations it's essentially infinite to human experience. We can figure out the rules of nature by studying the way processes follow them, and deduce what's going on behind the scenes. And whenever we do, we see science.
This makes me think of Richard Feynman's ode to the scientific beauty of a flower:
I have a friend who's an artist and has sometimes taken a view which I don't agree with very well. He'll hold up a flower and say "look how beautiful it is," and I'll agree. Then he says "I as an artist can see how beautiful this is but you as a scientist take this all apart and it becomes a dull thing," and I think that he's kind of nutty. First of all, the beauty that he sees is available to other people and to me too, I believe. Although I may not be quite as refined aesthetically as he is ... I can appreciate the beauty of a flower. At the same time, I see much more about the flower than he sees. I could imagine the cells in there, the complicated actions inside, which also have a beauty. I mean it's not just beauty at this dimension, at one centimeter; there's also beauty at smaller dimensions, the inner structure, also the processes. The fact that the colors in the flower evolved in order to attract insects to pollinate it is interesting; it means that insects can see the color. It adds a question: does this aesthetic sense also exist in the lower forms? Why is it aesthetic? All kinds of interesting questions which the science knowledge only adds to the excitement, the mystery and the awe of a flower. It only adds. I don't understand how it subtracts.
Every day on Earth, an estimated 371,124 people are born and 154,995 people die. When you ask Wolfram Alpha about these rates, the scientifically inclined site returns a curious corresponding quantity: the frequency in hertz (aka the number of cycles/second in a periodic occurrence).
Measurement in hertz is an unusual way to think about living and dying; hertz are typically reserved for things like human-audible sound frequencies (20 to 16,000 Hz), how fast your laptop's CPU runs (1 to 4 Ghz), or the frequency of the power running into your house (50 to 60 Hz). But if you subtract the death rate from the birth rate, you get a net rate of 216,129 new people a day, or about 2.5 Hz. That's the frequency of humanity. While that's a lot slower than your computer, it's in the same frequency ballpark as a human's resting heart rate (1.3 Hz), steps taken while walking briskly (1.8 Hz), or moderately energetic dance music (2.25 Hz).
Note: Illustration by Chris Piascik...check out his shop, where you'll find prints, tshirts, iPhone cases, etc.
In 1976, legendary cosmologist and astronomer Carl Sagan tried to recruit a 17-year-old Neil deGrasse Tyson to Cornell University. In April of that year, Tyson wrote Sagan a letter informing him of his intention to enroll at Harvard instead:
The Viking Missions referred to in the letter were the two probes sent to Mars in the mid-1970s.
Tyson occupies a role in today's society similar to Sagan's in the 1980s as an unofficial public spokesman of the wonderous world of science. Tyson is even hosting an updated version of Sagan's seminal Cosmos series for Fox, which debuts on March 9th. Here's a trailer:
Letter courtesy of The Seth Macfarlane Collection of the Carl Sagan and Ann Druyan Archive at the Library of Congress, which is chock full of great Sagan stuff. And yeah, that's Seth Macfarlane, creator of Family Guy and much-maligned host of the Oscars. Macfarlane was a big fan of the original Cosmos series and was instrumental in getting the new series made. (via @john_overholt)
A geothermal engineering project in Iceland drilled 1.3 miles into the Earth and unexpectedly hit a pocket of magma. Instead of capping the hole, as was done in a similar instance previously, they decided to see if they could harness the energy of the magma.
"Drilling into magma is a very rare occurrence, and this is only the second known instance anywhere in the world," Elders said. The IDDP and Iceland's National Power Company, which operates the Krafla geothermal power plant nearby, decided to make a substantial investment to investigate the hole further.
This meant cementing a steel casing into the well, leaving a perforated section at the bottom closest to the magma. Heat was allowed to slowly build in the borehole, and eventually superheated steam flowed up through the well for the next two years.
Elders said that the success of the drilling was "amazing, to say the least", adding: "This could lead to a revolution in the energy efficiency of high-temperature geothermal projects in the future."
The well funnelled superheated, high-pressure steam for months at temperatures of over 450°C -- a world record. In comparison, geothermal resources in the UK rarely reach higher than around 60-80°C.
In a short video from The Atlantic, science writer Philip Ball explains why Isaac Newton picked ROYGBIV (red, orange, yellow, green, blue, indigo, and violet) for the colors of the spectrum and not 3 or 6 or even 16 other possible colors.
Newton was the first to demonstrate through his famous prism experiments that color is intrinsic to light. As part of those experiments, he also divvied up the spectrum in his own idiosyncratic way, giving us ROYGBIV. Why indigo? Why violet? We don't really know why Newton decided there were two distinct types of purple, but we do know he thought there should be seven fundamental colors.
Ball is the author of Bright Earth: Art and the Invention of Color, which looks pretty interesting. His mention in the video of the changing perception of color throughout history reminds me of my favorite segment of Radiolab, which covers that very topic.
In a thread about the newly visible supernova in the M82 galaxy, MetaFilter user Ivan Fyodorovich offered up this plain-English explanation of what happens when a star dies and goes supernova. It's a great read.
It will take it just 6 months to burn up its oxygen. Again, when there's not enough oxygen being fused to generate energy to balance the pressure of gravitational contraction, the star begins to shrink, almost doubling the temperature, tripling the density, and causing the silicon (which was produced by the oxygen fusion) to begin fusing, in its own complicated sequence involving the alpha process, with the end result of nickel-56 (which radioactively decays into cobalt-56 and iron-56). This, as before, balances against the gravitational pressure and returns the star to equilibrium.
And now it will take merely 1 day to burn up its silicon. Finally, when there's not enough silicon being fused to generate energy to balance the pressure of gravitational contraction, the star begins to shrink.
This time, however, the core of the star is mostly nickel and iron, and they cannot ordinarily be fused into heavier elements, so as the star shrinks and the temperature and density increase, there is no nuclear fusion ignition of the nickel and iron to counteract the contraction. Here the limit of pressure and density is the electron degeneracy pressure, which is the resistance of electrons being forced to occupy the same energy states, which they can't.
In an "only Nixon can go to China" moment in physics, Stephen Hawking now says "there are no black holes".
Most physicists foolhardy enough to write a paper claiming that "there are no black holes" -- at least not in the sense we usually imagine -- would probably be dismissed as cranks. But when the call to redefine these cosmic crunchers comes from Stephen Hawking, it's worth taking notice. In a paper posted online, the physicist, based at the University of Cambridge, UK, and one of the creators of modern black-hole theory, does away with the notion of an event horizon, the invisible boundary thought to shroud every black hole, beyond which nothing, not even light, can escape.
In its stead, Hawking's radical proposal is a much more benign "apparent horizon", which only temporarily holds matter and energy prisoner before eventually releasing them, albeit in a more garbled form.
A supernova erupted recently1 in galaxy M82, a mere 11.4 million light years away from Earth, which means that it was close enough to be discovered by someone using an ordinary telescope in London and may be visible with binoculars sometime in the next two weeks.
M82's proximity means that there are many existing images of it, pre-explosion, including some from the Hubble Space Telescope. Cao and others will comb through those images, looking for what lay in the region before. It will not be easy: M82 is filled with dust. But the light the supernova shines on the dust could teach astronomers something about the host galaxy, too. One team is already looking for radioactive elements, such as nickel, that theories predict form in such supernova, says Shri Kulkarni, an astronomer at California Institute of Technology. "Dust has its own charms."
Sheryl Canter extensively researched the best way to season a cast iron pan and here is what she recommends you do. (Because science.)
I've read dozens of Web pages on how to season cast iron, and there is no consensus in the advice. Some say vegetable oils leave a sticky surface and to only use lard. Some say animal fat gives a surface that is too soft and to only use vegetable oils. Some say corn oil is the only fat to use, or Crisco, or olive oil. Some recommend bacon drippings since lard is no longer readily available. Some say you must use a saturated fat -- that is, a fat that is solid at room temperature, whether it's animal or vegetable (palm oil, coconut oil, Crisco, lard). Some say never use butter. Some say butter is fine. Some swear by Pam (spray-on canola oil with additives). Some say the additives in Pam leave a residue at high temperatures and pure canola oil is best. Some say it doesn't matter what oil you use.
They are all wrong. It does matter what oil you use, and the oil that gives the best results is not in this list. So what is it? Here are some hints: What oil do artists mix with pigment for a high quality oil paint that dries hard and glassy on the canvas? What oil is commonly used by woodturners to give their sculptures a protective, soft-sheen finish? It's the same oil. Now what is the food-grade equivalent of this oil?
The oil used by artists and woodturners is linseed oil. The food-grade equivalent is called flaxseed oil. This oil is ideal for seasoning cast iron for the same reason it's an ideal base for oil paint and wood finishes. It's a "drying oil", which means it can transform into a hard, tough film. This doesn't happen through "drying" in the sense of losing moisture through evaporation. The term is actually a misnomer. The transformation is through a chemical process called "polymerization".
Those before and after photos are hard to argue with. (via @akuban)
Update: Canter wrote a bit more about seasoning and added an extra step to the process. (via @_Atticus)
Scientists at the University of Vermont's Proctor Maple Research Center have made an interesting discovery. It seems that the sap used to produce maple syrup doesn't flow from the tops of trees, it gets sucked up from the trees' roots. Which means that maple syrup makers can use saplings instead of fully grown maple trees to produce syrup.
They realized that their discovery meant sugarmakers could use saplings, densely planted in open fields, to harvest sap. In other words, it is possible that maple syrup could now be produced as a row crop like every other commercial crop in North America.
In a natural forest, which varies in maple density, an average 60 to 100 taps per acre will yield 40 to 50 gallons of syrup. According to the researchers' calculations, an acre of what is now called "the plantation method" could sustain 5,800 saplings with taps yielding 400 gallons of syrup per acre. If the method is realized, producing maple syrup on a commercial scale may no longer be restricted to those with forest land; it could require just 50 acres of arable land instead of 500 acres of forest. Furthermore, any region with the right climate for growing maples would be able to start up maple "farms". The natural forest would become redundant.
First of all, how cute are these foxes jumping up and diving down into the snow after mice?
So. Cute. Here's Robert Krulwich on what they're up to:
Think about this ... an ordinary fox can stalk a mole, mouse, vole or shrew from a distance of 25 feet, which means its food is making a barely audible rustling sound, hiding almost two car lengths away. And yet our fox hurls itself into the air -- in an arc determined by the fox, the speed and trajectory of the scurrying mouse, any breezes, the thickness of the ground cover, the depth of the snow -- and somehow (how? how?), it can land straight on top of the mouse, pinning it with its forepaws or grabbing the mouse's head with its teeth.
Look at those ears and how the fox moves his head around to zero in on the mouse's location...reminds me of the pre-radar acoustic location devices (sometimes called war tubas) used in the early 20th century to detect approaching aircraft:
Let slip the tubas of war! Aaaaanyway, as the acoustic location device gave way to the more effective radar, so too is the fox more successful at hunting when he is pointed northeast -- a kind of magnetic radar, if you will. Fascinating.
A pair of scientists recently searched the internet for evidence of time travel.
Here, three implementations of Internet searches for time travelers are described, all seeking a prescient mention of information not previously available. The first search covered prescient content placed on the Internet, highlighted by a comprehensive search for specific terms in tweets on Twitter. The second search examined prescient inquiries submitted to a search engine, highlighted by a comprehensive search for specific search terms submitted to a popular astronomy web site. The third search involved a request for a direct Internet communication, either by email or tweet, pre-dating to the time of the inquiry. Given practical verifiability concerns, only time travelers from the future were investigated.
Spoiler: they didn't find any. (via @CharlesCMann)
Inspired by the escalating blade count of the razor industry, Nabisco has developed a new snack called the Quadriscuit.
"At the moment, this hyperwafer can only exist for six milliseconds in a precisely calibrated field of magnetic energy, positrons, roasted garlic, and beta particles," lab chief Dr. Paul Ellison told reporters at a press conference outside Nabisco's $200 million seven-whole-grain accelerator.
The last line of the piece made me LOL for real. (thx, meg)
In a feature straight out of the movies, Dr. Rob Jenkins and his team have demonstrated that for sufficiently high-resolution photos, recognizable images of reflected faces of the photographer and bystanders can be retrieved from a subject's eyes.
The researchers say that in crimes in which the victims are photographed, such as hostage taking or child sex abuse, reflections in the eyes of the photographic subject could help to identify perpetrators. Images of people retrieved from cameras seized as evidence during criminal investigations could be used to piece together networks of associates or to link individuals to particular locations.
By zooming in on high-resolution passport-style photographs, Jenkins and co-researcher Christie Kerr of the School of Psychology, University of Glasgow were able to recover bystander images that could be identified accurately by observers, despite their low resolution.
Here's some older research about reading confidential data using reflections from tea pots, glasses, eyes, and even diffuse materials like fabric. And of course, there's the famous eBay tea kettle. (via waxy)
Plants eat light, grow almost everywhere on Earth, and make up 99% of the planet's biomass. But do what extent do plants think? Or feel? Michael Pollan tackles the question of plant intelligence in a thought-provoking article for the New Yorker (sadly behind their paywall).
Indeed, many of the most impressive capabilities of plants can be traced to their unique existential predicament as beings rooted to the ground and therefore unable to pick up and move when they need something or when conditions turn unfavorable. The "sessile life style" as plant biologists term it, calls for an extensive and nuanced understanding of one's immediate environment, since the plant has to find everything it needs, and has to defend itself, while remaining fixed in place. A highly developed sensory apparatus is required to locate food and identify threats. Plants have evolved between fifteen and twenty different senses, including analogues of our five: smell and taste (they sense and respond to chemicals in the air or on their bodies); sight (they react differently to various wavelengths of light as well as to shadow); touch (a vine or root "knows" when it encounters a solid object); and, it has been discovered, sound.
In a recent experiment, Heidi Appel, a chemical ecologist at the University of Missouri, found that, when she played a recording of a caterpillar chomping a leaf for a plant that hadn't been touched, the sound primed the the plant's genetic machinery to produce defense chemicals. Another experiment, dome in Mancuso's lab and not yet published, found that plant roots would seek out a buried pipe through which water was flowing even if the exterior of the pipe was dry, which suggested that plants somehow "hear" the sound of flowing water.
One of the researchers featured in the article, Stefano Mancuso, has a TED talk available in which he outlines his case for plant intelligence:
The article also discusses if plants have feelings. If so, should we feel bad that our wifi routers might kill plants?
There's art on the Moon, a small sculpture called Fallen Astronaut. Artist Paul van Hoeydonck made it. Commander David Scott of Apollo 15 placed it on the Moon in 1971. Instead of a triumph, the whole thing fell into scandal and was forgotten.
In reality, van Hoeydonck's lunar sculpture, called Fallen Astronaut, inspired not celebration but scandal. Within three years, Waddell's gallery had gone bankrupt. Scott was hounded by a congressional investigation and left NASA on shaky terms. Van Hoeydonck, accused of profiteering from the public space program, retreated to a modest career in his native Belgium. Now both in their 80s, Scott and van Hoeydonck still see themselves unfairly maligned in blogs and Wikipedia pages-to the extent that Fallen Astronaut is remembered at all.
And yet, the spirit of Fallen Astronaut is more relevant today than ever. Google is promoting a $30 million prize for private adventurers to send robots to the moon in the next few years; companies such as SpaceX and Virgin Galactic are creating a new for-profit infrastructure of human spaceflight; and David Scott is grooming Brown University undergrads to become the next generation of cosmic adventurers.
Governments come and go, public sentiment waxes and wanes, but the dream of reaching to the stars lives on. Fallen Astronaut does, too, hanging eternally 238,000 miles above our heads. Here, for the first time, we tell the full, tangled tale behind one of the smallest yet most extraordinary achievements of the Space Age.
In a fly-by of Earth on its way to Jupiter, NASA's Juno probe took a short movie of the Moon orbiting the Earth. It's the first time the Moon's orbit has been captured on film.
Using a large piece of spandex (representing spacetime) and some balls and marbles (representing masses), a high school science teacher explains how gravity works.
The bits about how the planets all orbit in the same direction and the demo of the Earth/Moon orbit are really neat. And you can stop watching around the 7-minute mark...the demos end around then.
Update: Here's another video of a similar system with some slightly different demos.
From a blog about the science of dogs, a comparison of photos of purebred dogs from 1915 to those of today. You can see how much the dogs have changed in just under 100 years, in some cases for the worse. For instance, the difference in the Bull Terrier (aka the Spuds MacKenzie dog) is marked and a bit disturbing:
Pure breeding has also introduced medical problems for some breeds.
The English bulldog has come to symbolize all that is wrong with the dog fancy and not without good reason; they suffer from almost every possible disease. A 2004 survey by the Kennel Club found that they die at the median age of 6.25 years (n=180). There really is no such thing as a healthy bulldog. The bulldog's monstrous proportions makes them virtually incapable of mating or birthing without medical intervention.
Your body clock alarm is just as accurate as the one on your phone: your body naturally takes note of what time you want to wake up and wakes you up.
There's evidence you can will yourself to wake on time, too. Sleep scientists at Germany's University of Lubeck asked 15 volunteers to sleep in their lab for three nights. One night, the group was told they'd be woken at 6 a.m., while on other nights the group was told they'd be woken at 9 a.m..
But the researchers lied-they woke the volunteers at 6 a.m anyway. And the results were startling. The days when sleepers were told they'd wake up early, their stress hormones increased at 4:30 a.m., as if they were anticipating an early morning. When the sleepers were told they'd wake up at 9 a.m., their stress hormones didn't increase -- and they woke up groggier. "Our bodies, in other words, note the time we hope to begin our day and gradually prepare us for consciousness," writes Jeff Howe at Psychology Today.
From Wikipedia, a list of products and technologies that have been developed with the help of NASA, including memory foam, Dustbusters, and powdered lubricants.
For more than 50 years, the NASA Innovative Partnerships Program has connected NASA resources to private industry, referring to the commercial products as spin-offs. Well-known products that NASA claims as spin-offs include memory foam (originally named temper foam), freeze-dried food, firefighting equipment, emergency "space blankets", Dustbusters, cochlear implants, and now Speedo's LZR Racer swimsuits. NASA claims that there are over 1650 other spin-offs in the fields of computer technology, environment and agriculture, health and medicine, public safety, transportation, recreation, and industrial productivity.
NASA did not, however, invent Teflon or Velcro. (via @tangentialism)
Hans Bethe was a giant in the field of nuclear physics. He rubbed shoulders with Einstein, Bohr, and Pauli, was head of the Theoretical Division of the US atomic bomb project, and was awarded a Nobel Prize. In 1999, at the age of 93, Bethe gave a series of three lectures to the residents of his retirement community near Cornell University, where he had taught since 1935. Video of the lectures is available on the Cornell website.
In the first lecture, Bethe covers the development of the "old quantum theory", covering the work of Max Planck and Niels Bohr. In the second and third lectures, he relates how modern quantum mechanics was developed, with a healthy amount of personal recollection along the way:
Professor Bethe offers personal anecdotes about many of the famous names commonly associated with quantum physics, including Bohr, Heisenberg, Born, Pauli, de Broglie, Schrödinger, and Dirac.
Without a doubt, this is the most high-power presentation ever made at a retirement home. (via @stevenstrogatz)
Google and NASA recently bought a D-Wave quantum computer. But according to a piece by Sophie Bushwick published on the Physics Buzz Blog, there isn't scientific consensus on whether the computer is actually using quantum effects to calculate.
In theory, quantum computers can perform calculations far faster than their classical counterparts to solve incredibly complex problems. They do this by storing information in quantum bits, or qubits.
At any given moment, each of a classical computer's bits can only be in an "on" or an "off" state. They exist inside conventional electronic circuits, which follow the 19th-century rules of classical physics. A qubit, on the other hand, can be created with an electron, or inside a superconducting loop. Obeying the counterintuitive logic of quantum mechanics, a qubit can act as if it's "on" and "off" simultaneously. It can also become tightly linked to the state of its fellow qubits, a situation called entanglement. These are two of the unusual properties that enable quantum computers to test multiple solutions at the same time.
But in practice, a physical quantum computer is incredibly difficult to run. Entanglement is delicate, and very easily disrupted by outside influences. Add more qubits to increase the device's calculating power, and it becomes more difficult to maintain entanglement.
(via fine structure)
Not to get all Malcolm Gladwell here, but it's counterintuitive that hot water freezes faster than cold water. The phenomenon is called the Mpemba effect and until recently, no one could explain how it works. A group of researchers in Singapore think they've cracked the puzzle.
Now Xi and co say hydrogen bonds also explain the Mpemba effect. Their key idea is that hydrogen bonds bring water molecules into close contact and when this happens the natural repulsion between the molecules causes the covalent O-H bonds to stretch and store energy.
But as the liquid warms up, it forces the hydrogen bonds to stretch and the water molecules sit further apart. This allows the covalent molecules to shrink again and give up their energy. The important point is that this process in which the covalent bonds give up energy is equivalent to cooling.
In fact, the effect is additional to the conventional process of cooling. So warm water ought to cool faster than cold water, they say. And that's exactly what is observed in the Mpemba effect.
This video dicusses three simple ways to travel through time (all of which you can do right now at home) and three not-so-simple time travel methods.
For more on time-travel, here are some works by physicist and time-lord Sean Carroll:
Rules for time-travellers - http://blogs.discovermagazine.com/cos...
Learn more about time and time-machines in his book From Eternity to Here - http://preposterousuniverse.com/etern...
Visualizations of the spinning universe - http://iopscience.iop.org/1367-2630/1...
An engaging talk on the Paradoxes of Time Travel - https://vimeo.com/11917849
NASA's Solar Dynamics Observatory is getting some really amazing shots of the Sun, including this 200,000 mile-long solar eruption that left a huge canyon on the surface of the Sun:
Different wavelengths help capture different aspect of events in the corona. The red images shown in the movie help highlight plasma at temperatures of 90,000° F and are good for observing filaments as they form and erupt. The yellow images, showing temperatures at 1,000,000° F, are useful for observing material coursing along the sun's magnetic field lines, seen in the movie as an arcade of loops across the area of the eruption. The browner images at the beginning of the movie show material at temperatures of 1,800,000° F, and it is here where the canyon of fire imagery is most obvious.
The level of detail shown is incredible. (via @DavidGrann)
In an interview accompanying a Frontline episode on drug-resistant bacteria, an associate director for the CDC, Dr. Arjun Srinivasan, says that "we're in the post-antibiotic era".
The more you use an antibiotic, the more you expose a bacteria to an antibiotic, the greater the likelihood that resistance to that antibiotic is going to develop. So the more antibiotics we put into people, we put into the environment, we put into livestock, the more opportunities we create for these bacteria to become resistant. ...We also know that we've greatly overused antibiotics and in overusing these antibiotics, we have set ourselves up for the scenario that we find ourselves in now, where we're running out of antibiotics.
We are quickly running out of therapies to treat some of these infections that previously had been eminently treatable. There are bacteria that we encounter, particularly in health-care settings, that are resistant to nearly all -- or, in some cases, all -- the antibiotics that we have available to us, and we are thus entering an era that people have talked about for a long time.
For a long time, there have been newspaper stories and covers of magazines that talked about "The end of antibiotics, question mark?" Well, now I would say you can change the title to "The end of antibiotics, period."
We're here. We're in the post-antibiotic era. There are patients for whom we have no therapy, and we are literally in a position of having a patient in a bed who has an infection, something that five years ago even we could have treated, but now we can't.
You know how when you first hear a joke it's the funniest thing ever and then you hear it a second time and it's less funny and then a third, fourth, and fifth times and it just keeps getting less and less funny until you're not laughing at all and it actually becomes annoying? That's how antibiotics work across the entire human population. And if Dr. Srinivasan is correct, we're transitioning into the not laughing stage and the annoying stage where lots of people start dying can't be far behind (unless we get some new jokes/treatments).
Yesterday, Mark Sample tweeted about disasters, low-points, and chronic trauma:
"Low point" is the term for when the worst part of a disaster has come to pass. Our disasters increasingly have no low point.
After the low point of a disaster is reached, things begin to get better. When there is no clear low point, society endures chronic trauma.
Disasters with no clear low point: global warming, mass extinction, colony collapse disorder, ocean acidification, Fukushima.
To which I would add: drug-resistant infectious diseases. (via digg)
With $10 and a little elbow grease, you can turn your iPhone into a really nice digital microscope capable of 175x magnification, allowing you to take photos of plant cells:
Here's how you do it:
For the New York Review of Books, theoretical physicist and Nobel laureate Steven Weinberg gives us an update on what we know and don't know about physics.
It turns out that particles already known to us are not enough to account for the mass of the hot matter in which the sound waves must have propagated. Fully five sixths of the matter of the universe would have to be some kind of "dark matter," which does not emit or absorb light. The existence of this much dark matter in the present universe had already been inferred from the fact that clusters of galaxies hold together gravitationally, despite the high random speeds of the galaxies in the clusters. So this is a great puzzle: What is the dark matter? Theories abound, and attempts are underway to catch ambient dark matter particles or remnants of their annihilation in detectors on Earth or to create dark matter in accelerators. But so far dark matter has not been found, and no one knows what it is.
Over at The Planetary Society, Emily Lakdawalla highlighted an image taken by the Cassini spacecraft of Saturn separate from its rings.
This enormous mosaic showing the flattened globe of Saturn floating amongst the complete disk of its rings must surely be counted among the great images of the Cassini mission. From Earth, we never see Saturn separate from its rings. Here, we can see the whole thing, a gas giant like Jupiter, separated at last from the rings that encircle it.
Taking this idea one step further, I removed the rings completely, along with the "ringlight" lighting up the night hemisphere, creating a more-or-less pure look of what Saturn would look like without its rings.
Larger version is available on Mlkshk.
Google's got themselves a quantum computer (they're sharing it with NASA) and they made a little video about it:
I'm sure that Hartmut is a smart guy and all, but he's got a promising career as an Arnold Schwarzenegger impersonator hanging out there if the whole Google thing doesn't work out.
A promising debut by Sarah Pavis of a science program called Square 1, an attempt at a Connections-like show for the modern day. In the first episode, she explores how phone touchscreens work.
In addition to being an occasional guest editor around these parts, Sarah is a mechanical engineer, so she knows her science.
What if there were a new class of wonder drugs for children that prevented some of the worst diseases in history with very limited side effects...would you take them?
Some people don't "trust" that wacky "science" though.
What's so confounding is that many of the parents requesting exemptions for their children cite specious, disproven fears -- such as that the vaccine could cause autism -- many of which were based on a fraudulent, retracted study or fringe research published in non-peer-reviewed journals. And the rest of the country hasn't been as successful as Massachusetts in containing measles infections. Earlier this year, an intentionally unvaccinated 17-year-old from Brooklyn, New York, was infected with measles while on a trip to the United Kingdom. Because he lived in a community with a large number of other deliberately unvaccinated children, the virus quickly spread. By the time the outbreak was contained, 58 people had been infected -- making it the largest outbreak in the country in more than 15 years. Nationwide, the Centers for Disease Control and Prevention reported 159 total cases between January and August, which puts 2013 on track to record the most domestic measles infections since the disease was declared eliminated from the United States in 2000.
Declared eliminated! [Hair-tearing-out noise]
Scientists have discovered the source of a massive 13th century volcanic eruption: a volcano called Samalas on Indonesia's Lombok Island. The blast was eight times as powerful as Krakatoa.
Though the eruption was equatorial, its impact was felt and noted around the world. "The climate was disturbed for at least two years after the eruption," Lavigne said. Evidence of this was found in studies of tree rings that revealed abnormal growth rates, climate models, and historical records from as far afield as Europe."
Medieval chronicles, for example, describe the summer of 1258 as unseasonably cold, with poor harvests and incessant rains that triggered destructive floods -- a "year without a summer." The winter immediately following the eruption was warmer in western Europe, however, as would be expected from high-sulfur eruptions in the tropics. The team cites historical records from Arras (northern France) that speak of a winter so mild "that frost barely lasted for more than two days," and even in January 1258 "violets could be observed, and strawberries and apple trees were in blossom."
Note that at a volume of 40 km3 of debris, Samalas doesn't even come close to being on the list of the 40 most explosive volcanic eruptions in history, most of which happened millions of years ago. (via digg)
Light (aka electromagnetic radiation) is responsible for most of what we know about the universe. By measuring photons of various frequencies in different ways -- "the careful collection of ancient light" -- we've painted a picture of our endless living space. But light isn't perfect. It can bend, scatter, and be blocked. Changes in gravity are more difficult to detect, but new instruments may allow scientists to construct a different map of the universe and its beginnings.
LIGO works by shooting laser beams down two perpendicular arms and measuring the difference in length between them-a strategy known as laser interferometry. If a sufficiently large gravitational wave comes by, it will change the relative length of the arms, pushing and pulling them back and forth. In essence, LIGO is a celestial earpiece, a giant microphone that listens for the faint symphony of the hidden cosmos.
Like many exotic physical phenomena, gravitational waves originated as theoretical concepts, the products of equations, not sensory experience. Albert Einstein was the first to realize that his general theory of relativity predicted the existence of gravitational waves. He understood that some objects are so massive and so fast moving that they wrench the fabric of spacetime itself, sending tiny swells across it.
How tiny? So tiny that Einstein thought they would never be observed. But in 1974 two astronomers, Russell Hulse and Joseph Taylor, inferred their existence with an ingenious experiment, a close study of an astronomical object called a binary pulsar [see "Gravitational Waves from an Orbiting Pulsar," by J. M. Weisberg et al.; Scientific American, October 1981]. Pulsars are the spinning, flashing cores of long-exploded stars. They spin and flash with astonishing regularity, a quality that endears them to astronomers, who use them as cosmic clocks. In a binary pulsar system, a pulsar and another object (in this case, an ultradense neutron star) orbit each other. Hulse and Taylor realized that if Einstein had relativity right, the spiraling pair would produce gravitational waves that would drain orbital energy from the system, tightening the orbit and speeding it up. The two astronomers plotted out the pulsar's probable path and then watched it for years to see if the tightening orbit showed up in the data. The tightening not only showed up, it matched Hulse and Taylor's predictions perfectly, falling so cleanly on the graph and vindicating Einstein so utterly that in 1993 the two were awarded the Nobel Prize in Physics.
Friday morning is as good a time as any to revisit what I consider one of the quintessential Kottke.org post(s), The case of the plane and conveyor belt. Essentially, will an airplane take off on a treadmill. Prompted by a question on The Straight Dope, the post, now over 7 years old, has everything you need for a Kottke.org post: airplanes, physics, a waffle, and careful consideration of the facts. The question was addressed again a few days later to definitively and succinctly put the argument to rest.
Now that I've closed the comments on the question of the airplane and the conveyor belt, I'm still getting emails calling me an idiot for thinking that the plane will take off. Having believed that after first hearing the question and formulating several reasons reinforcing my belief, I can sympathize with that POV, but that doesn't change the fact that I was initially wrong and that if you believe the plane won't take off, you're wrong too.
A 2008 liveblog of an episode of Mythbusters, further cemented the following notion:
For what it's worth commenters almost everywhere continue to disagree. For more opinions, see here, here, here, here.
In the 1980s, Charles Ehret developed an antidote to jet lag called The Argonne Anti-Jet-Lag-Diet.
After experimenting on protozoa, rats, and his eight children, Ehret recommended that the international traveler, in the several days before his flight, alternate days of feasting with days of very light eating. Come the flight, the traveler would nibble sparsely until eating a big breakfast at about 7:30 a.m. in his new time zone -- no matter that it was still 1:30 a.m. in the old time zone or that the airline wasn't serving breakfast until 10:00 a.m. His reward would be little or no jet lag.
The diet was adopted by US government agencies and other groups as well as Ronald Reagan, but it difficult to stick to. Recently, researchers in Boston have devised a simpler anti-jet lag remedy:
The international traveler, they counsel, can avoid jet lag by simply not eating for twelve to sixteen hours before breakfast time in the new time zone-at which point, as in Ehret's diet, he should break his fast. Since most of us go twelve to sixteen hours between dinner and breakfast anyway, the abstention is a small hardship.
According to the Harvard team, the fast works because our bodies have, in addition to our circadian clock, a second clock that might be thought of as a food clock or, perhaps better, a master clock. When food is scarce, this master clock suspends the circadian clock and commands the body to sleep much less than normally. Only after the body starts eating again does the master clock switch the circadian clock back on.
Totally trying this the next time I have to travel, although the Advil PM/melatonin combination my doctor suggested worked really well for me on my trip to New Zealand. (via @genmon)
I had no idea that's how rubber bands worked. Once again, Feynman takes something that seems pretty simple and makes it both simpler and vividly complex.
A Texas man was getting drunk without drinking alcohol and his doctors think they figured out why: brewer's yeast in his in gut was brewing beer and making the man intoxicated.
The patient had an infection with Saccharomyces cerevisiae, Cordell says. So when he ate or drank a bunch of starch -- a bagel, pasta or even a soda -- the yeast fermented the sugars into ethanol, and he would get drunk. Essentially, he was brewing beer in his own gut. Cordell and McCarthy reported the case of "auto-brewery syndrome" a few months ago in the International Journal of Clinical Medicine.
Some clever entrepreneur will undoubtedly turn this syndrome into a product...the market opportunity for a pill that allows you to get drunk on spaghetti *and* be the owner/operator of your own microbrewery is too large to ignore. (via ★interesting)