kottke.org posts about science
Today NASA announced the discovery of seven planets “that could harbor life” around a dwarf star called Trappist-1.
The planets orbit a dwarf star named Trappist-1, about 40 light years, or about 235 trillion miles, from Earth. That is quite close, and by happy accident, the orientation of the orbits of the seven planets allows them to be studied in great detail.
One or more of the exoplanets - planets around stars other than the sun - in this new system could be at the right temperature to be awash in oceans of water, astronomers said, based on the distance of the planets from the dwarf star.
“This is the first time so many planets of this kind are found around the same star,” said Michael Gillon, an astronomer at the University of Liege in Belgium and the leader of an international team that has been observing Trappist-1.
Here’s the paper published in Nature.
In his newest video, Evan Puschak talks about Arrival, calling it “a response to bad movies”. Arrival was perhaps my favorite film of 2016, and I agree with him about how well-made this film is. There’s a top-to-bottom attention to craft on display, from how it looks to how it was cast (Amy Adams was the absolute perfect choice for the lead) to the integration of the theme with story to how expertly it was adapted from Ted Chiang’s Story of Your Life. The whole thing’s tight as a drum. If you happened to miss it, don’t watch this video (it gives the whole thing away) and go watch it instead…it’s available to rent/buy on Amazon.
Looking back through the archives, I’m realizing I never did a post about Arrival even though I collected some links about it. So, linkdump time!
Wired wrote about how the movie’s alien alphabet was developed.
Stephen Wolfram wrote about his involvement with the science of the film — his son Christopher wrote Mathematica code for some of the on-screen visuals. 1
Science vs Cinema explored how well the movie represented actual science:
Screenwriter Eric Heisserer wrote about how he adapted Chiang’s short story for the screen.
Jordan Brower wrote a perceptive review/analysis that includes links to several other resources about the film.
Update: The director of photography for Arrival was Bradford Young, who shot Selma and is currently working on the Han Solo movie for Disney. Young did an interview with No Film School just before Arrival came out.
I’m from the South, so quilts are a big part of telling our story. Quilting is ancient, but in the South it’s a very particular translation of idea, time, and space. In my own practice as an image maker, I slowly began to be less concerned with precision and more concerned with feeling.
Quiltmakers are rigorous, but they’re a mixed media format. I think filmmaking should be a mixed media format. I’m just really honoring what quiltmakers do, which is tell a story by using varying texture within a specific framework to communicate an idea. For me, with digital technology, lenses do that the best. The chips don’t do it now-digital film stock is basically all captured the same, but the lenses are how you give the image its textural quality.
In Focus is featuring some of the winning shots from the 2017 Underwater Photographer of the Year awards. The top one is Dancing Octopus taken by Gabriel Barathieu and the bottom one is by Qing Lin, who took the photo near Lembeh, Indonesia, which is home to some of the strangest marine life in the world.
If you look at Lin’s photo of the clownfish for more than a second or two — pay attention…this is the nightmarish side to living on the reef that Pixar kept from you in Finding Nemo — you will notice not just three pairs of eyes but six pairs of eyes. In the mouth of each clownfish is a parasitic isopod looking right at the camera. The isopod enters the fish through the gills, attaches itself to the fish’s tongue, feeds on the blood in the tongue until it falls off, and then attaches itself to the tongue stump. And the fish uses the isopod as a replacement tongue! Cool! And gross!
I finally got the chance to see Hidden Figures the other day. Recommended. It’s a science/space story in the vein of Apollo 13, but the twin engines of the film are the three excellent lead actresses — Taraji P. Henson, Octavia Spencer & Janelle Monáe — and the persistent portrayal of the systemic biases of segregation and sexism. You watch this movie and think, how much higher could the human race have flown if women and people of color had always had the same opportunities as white men?1 How many Katherine Johnsons never got the chance to develop and use their skills in math, science, or technology because of their skin color or gender? Our society wastes so much energy and human lives telling people what they can’t do rather than empowering them to show everyone what they can do.
Hidden Figures was adopted from Margot Lee Shetterly’s book of the same name. The film takes some dramatic license with the timing of certain events but overall is historically accurate.
The film primarily focuses on John Glenn’s 1962 trip around the globe and does add dramatic flourishes that are, well, Hollywood. However, most of the events in the movie are historically accurate. Johnson’s main job in the lead-up and during the mission was to double-check and reverse engineer the newly-installed IBM 7090s trajectory calculations. As it shows, there were very tense moments during the flight that forced the mission to end earlier than expected. And John Glenn did request that Johnson specifically check and confirm trajectories and entry points that the IBM spat out (albeit, perhaps, not at the exact moment that the movie depicts). As Shetterly wrote in her book and explained in a September NPR interview, Glenn did not completely trust the computer. So, he asked the head engineers to “get the girl to check the numbers… If she says the numbers are good… I’m ready to go.”
You can view Johnson’s published reports on NASA’s site, including her initial technical report from 1960 on the Determination of Azimuth Angle at Burnout for Placing a Satellite Over a Selected Earth Position.
In 2012, physicist Frank Wilczek speculated that it would be possible to make a crystal whose lattice repeats in four dimensions, not just three.
Wilczek thought it might be possible to create a similar crystal-like structure in time, which is treated as a fourth dimension under relativity. Instead of regularly repeating rows of atoms, a time crystal would exhibit regularly repeating motion.
Many physicists were sceptical, arguing that a time crystal whose atoms could loop forever, with no need for extra energy, would be tantamount to a perpetual motion machine — forbidden by the laws of physics.
Now, a team at Berkeley have succeeded in making time crystals, publishing a method that two other teams have already successfully followed.
For Yao’s time crystal, an external force — like the pulse of a laser — flips the magnetic spin of one ion in a crystal, which then flips the spin of the next, and so forth, setting the system into a repeating pattern of periodic motion.
There are two critical factors. First, after the initial driver, it must be a closed system, unable to interact with and lose energy to the environment. Second, interactions between quantum particles are the driving force behind the time crystal’s stability. “It’s an emergent phenomenon,” says Yao. “It requires many particles and many spins to talk to each other and collectively synchronise.”
In a 45-minute video called Riding Light, Alphonse Swinehart animates the journey outward from the Sun to Jupiter from the perspective of a photon of light. The video underscores just how slow light is in comparison to the vast distances it has to cover, even within our own solar system. Light takes 8.5 minutes to travel from the Sun to the Earth, almost 45 minutes to Jupiter, more than 4 years to the nearest star, 100,000 years to the center of our galaxy, 2.5 million years to the nearest large galaxy (Andromeda), and 32 billion years to reach the most remote galaxy ever observed.1 The music is by Steve Reich (Music for 18 Musicians), whose music can also seem sort of endless.
If you’re impatient, you can watch this 3-minute version, sped up by 15 times:
For his new book, Evolution: A Visual Record, photographer Robert Clark has collected dozens of images that show the varying ways in which plants and animals have adapted to their changing surroundings.
Evidence of evolution is everywhere. Through 200 revelatory images, award-winning photographer Robert Clark makes one of the most important foundations of science clear and exciting to everyone. Evolution: A Visual Record transports readers from the near-mystical (human ancestors) to the historic (the famous ‘finches’ Darwin collected on the Galapagos Islands that spurred his theory); the recently understood (the link between dinosaurs and modern birds) to the simply astonishing.
The photo above is of a southern cassowary, a flightless bird that is particularly dinosaur-esque in stature and appearance.
Testing human blood for tropical diseases like malaria can be difficult in some parts of the world. Centrifuges used to separate the blood for testing are expensive and require electricity. Researchers from Stanford have developed an ingenious human-powered centrifuge made of paper and string inspired by a children’s toy invented 5000 years ago (paging Steven Johnson, Steven Johnson to the courtesy desk please).
In a global-health context, commercial centrifuges are expensive, bulky and electricity-powered, and thus constitute a critical bottleneck in the development of decentralized, battery-free point-of-care diagnostic devices. Here, we report an ultralow-cost (20 cents), lightweight (2 g), human-powered paper centrifuge (which we name ‘paperfuge’) designed on the basis of a theoretical model inspired by the fundamental mechanics of an ancient whirligig (or buzzer toy; 3,300 BC). The paperfuge achieves speeds of 125,000 r.p.m. (and equivalent centrifugal forces of 30,000 g), with theoretical limits predicting 1,000,000 r.p.m. We demonstrate that the paperfuge can separate pure plasma from whole blood in less than 1.5 min, and isolate malaria parasites in 15 min.
A million rpm from paper and string…that’s incredible. (via gizmodo)
Climate change has shifted from being a scientific issue to a political issue, both because the science is settled1 and because conservatives have embraced climate denialism. As a result, when deep-sea biologist Andrew Thaler talks to people about climate change, he doesn’t talk about science. He talks to people about things like fishing:
Fishermen know that things are changing, that black bass, scup, and butterfish (an important prey species in the tuna fishery) are moving further and further north. Oystermen know that the increasingly high high tides have a negative effect on the recruitment and growth of commercial oysters. More importantly, fishing communities have records and cultural knowledge that go back centuries, and they can see from multi-generational experience that the seasons are less predictable now than in the past and that the changes taking place today are nothing like the more gradual changes of previous generations.
I know fishermen in Guinea living in houses that have stood for hundreds of years. Some of those houses now flood at high tide. Every high tide. They weren’t built at the water’s edge, the water’s edge came to them. I lived in the same house in Beaufort, North Carolina for ten years. When I moved in, we were high and dry. Now our street has a permanent “high water” sign. The farm I just left in coastal Virginia is inundated after heavy rains or strong tidal surges. The front fields, which once held vibrant gardens, now nurture short grass and salty soil.
And other things like farming and faith. People who aren’t scientists and have grown distrustful of them won’t be convinced by science. But they will believe stories that relate to important matters in their lives. (via @EricHolthaus)
Using mostly old-school visual effects — like ink dispersing in an aquarium and poking holes in napkins (to represent stars) — Thomas Vanz created a pretty compelling representation of a dying star going supernova.
Novae is a movie about an astronomical event that occurs during the last evolutionary stages of a massive star’s life, whose dramatic and catastrophic death is marked by one final titanic explosion called supernova.
By only using an aquarium, ink and water, this film is also an attempt to represent the giant with the small without any computed generated imagery.
As a tribute to Kubrick or Nolan’s filmography, Novae is a cosmic poem that want to introduce the viewer to the nebulae’s infinite beauty.
Vanz documented his process in these two videos, which are almost as entertaining as the finished product.
Each year, Edge has asked a group of scientists, philosophers, musicians, writers, and designers a simple but provocative question and collects the answers on their website. Past questions have included:
What do you think about machines that think? (2015)
What have you changed your mind about? Why? (2008)
What do you believe true even though you cannot prove it? (2005)
What is the most important invention in the past two thousand years? (1999)
This year, the question is: What scientific term or concept ought to be more widely known?
Of all the scientific terms or concepts that ought to be more widely known to help to clarify and inspire science-minded thinking in the general culture, none are more important than “science” itself.
Many people, even many scientists, have traditionally had a narrow view of science as controlled, replicated experiments performed in the laboratory-and as consisting quintessentially of physics, chemistry, and molecular biology. The essence of science is conveyed by its Latin etymology: scientia, meaning knowledge. The scientific method is simply that body of practices best suited for obtaining reliable knowledge.
Here are some of the responses. Alison Gopnik chose “Life History”:
“Life history” is the term biologists use to describe how organisms change over time-how long an animal lives, how long a childhood it has, how it nurtures its young, how it grows old. Human life history is weird. We have a much longer childhood than any other primate-twice as long as chimps, and that long childhood is related to our exceptional learning abilities. Fossil teeth suggest that this long childhood evolved in tandem with our big brains-we even had a longer childhood than Neanderthals. We also rapidly developed special adaptations to care for those helpless children-“pair-bonding” and “alloparents.” Fathers and unrelated kin help take care of human children, unlike our closest primate relatives.
And we developed another very unusual life history feature-post-menopausal grandmothers. The killer whale is the only other animal we know that outlives its fertility. The human lifespan was expanded at both ends-longer childhood and a longer old age. In fact, anthropologists have argued that those grandmothers were a key to the evolution of learning and culture. They were crucial for the survival of those helpless children and they also could pass on two generations worth of knowledge.
Jessica Flack chose “Coarse-Graining”:
In physics a fine-grained description of a system is a detailed description of its microscopic behavior. A coarse-grained description is one in which some of this fine detail has been smoothed over.
Coarse-graining is at the core of the second law of thermodynamics, which states that the entropy of the universe is increasing. As entropy, or randomness, increases there is a loss of structure. This simply means that some of the information we originally had about the system has become no longer useful for making predictions about the behavior of a system as a whole. To make this more concrete, think about temperature.
Temperature is the average speed of particles in a system. Temperature is a coarse-grained representation of all of the particles’ behavior — the particles in aggregate. When we know the temperature we can use it to predict the system’s future state better than we could if we actually measured the speed of individual particles. This is why coarse-graining is so important — it is incredibly useful. It gives us what is called an effective theory. An effective theory allows us to model the behavior of a system without specifying all of the underlying causes that lead to system state changes.
And physicist Nigel Goldenfeld chose “The Scientific Method” itself:
There’s a saying that there are no cultural relativists at thirty thousand feet. The laws of aerodynamics work regardless of political or social prejudices, and they are indisputably true. Yes, you can discuss to what extent they are an approximation, what are their limits of validity, do they take into account such niceties as quantum entanglement or unified field theory (of course they don’t). But the most basic scientific concept that is clearly and disturbingly missing from today’s social and political discourse is the concept that some questions have correct and clear answers. Such questions can be called “scientific” and their answers represent truth. Scientific questions are not easy to ask. Their answers can be verified by experiment or observation, and they can be used to improve your life, create jobs and technologies, save the planet. You don’t need pollsters or randomized trials to determine if a parachute works. You need an understanding of the facts of aerodynamics and the methodology to do experiments.
There are 200 more contributions from bold-faced names like Richard Dawkins, Hanna Levin, Brian Eno, Kevin Kelly, and Danny Hillis. Have fun!
Research on an arrangement of massive granite blocks in the Brazilian Amazon has indicated that they were used as an astronomical observatory about 1000 years ago.
After conducting radiocarbon testing and carrying out measurements during the winter solstice, scholars in the field of archaeoastronomy determined that an indigenous culture arranged the megaliths into an astronomical observatory about 1,000 years ago, or five centuries before the European conquest of the Americas began.
Their findings, along with other archaeological discoveries in Brazil in recent years — including giant land carvings, remains of fortified settlements and even complex road networks — are upending earlier views of archaeologists who argued that the Amazon had been relatively untouched by humans except for small, nomadic tribes.
I still remember reading Charles Mann’s piece in 2002 about the mounting evidence against the idea of a largely wild and pristine pair of continents civilized and tamed by Europeans.
Erickson and Balée belong to a cohort of scholars that has radically challenged conventional notions of what the Western Hemisphere was like before Columbus. When I went to high school, in the 1970s, I was taught that Indians came to the Americas across the Bering Strait about 12,000 years ago, that they lived for the most part in small, isolated groups, and that they had so little impact on their environment that even after millennia of habitation it remained mostly wilderness. My son picked up the same ideas at his schools. One way to summarize the views of people like Erickson and Balée would be to say that in their opinion this picture of Indian life is wrong in almost every aspect. Indians were here far longer than previously thought, these researchers believe, and in much greater numbers. And they were so successful at imposing their will on the landscape that in 1492 Columbus set foot in a hemisphere thoroughly dominated by humankind.
That article turned into 1491, which remains one of my favorite books.
See also Ars Technica’s recent piece Finding North America’s lost medieval city.
Earlier this year, the LIGO experiment detected evidence of gravitational waves. Now the evidence shows that those waves may have echoes, which would contradict one of the tentpoles of modern physics, the general theory of relativity.
It was hailed as an elegant confirmation of Einstein’s general theory of relativity — but ironically the discovery of gravitational waves earlier this year could herald the first evidence that the theory breaks down at the edge of black holes. Physicists have analysed the publicly released data from the Laser Interferometer Gravitational-Wave Observatory (LIGO), and claim to have found “echoes” of the waves that seem to contradict general relativity’s predictions.
The echoes could yet disappear with more data. If they persist, the finding would be extraordinary. Physicists have predicted that Einstein’s hugely successful theory could break down in extreme scenarios, such as at the centre of black holes. The echoes would indicate the even more dramatic possibility that relativity fails at the black hole’s edge, far from its core.
If the echoes go away, then general relativity will have withstood a test of its power — previously, it wasn’t clear that physicists would be able to test their non-standard predictions.
Paleontologist Lida Xing found the feathered tail of a tiny dinosaur trapped in a piece of amber for sale at a market in Myanmar.
As soon as Xing saw it, he knew it wasn’t a plant. It was the delicate, feathered tail of a tiny dinosaur.
“I have studied paleontology for more than 10 years and have been interested in dinosaurs for more than 30 years. But I never expected we could find a dinosaur in amber. This may be the coolest find in my life,” says Xing, a paleontologist at China University of Geosciences in Beijing. “The feathers on the tail are so dense and regular, this is really wonderful.”
From his seminal TV program Cosmos, Carl Sagan attempts to explain the fourth dimension of spacetime. The story starts with Edwin Abbott’s Flatland, but Sagan being Sagan, his explanation is especially lucid.
In this video, physicist Dominic Walliman explains how all of the various disciplines of physics are related to each other by arranging them on a giant map. He starts with the three main areas — classical physics, quantum mechanics, and relativity — and then gets into the more specific subjects like optics, electromagnetism, and particle physics before venturing across The Chasm of Ignorance (dun dun DUN!) where things like string theory and dark matter dwell.
Posters of The Map of Physics are available.
Poachers in Africa in search of the biggest ivory tusks have altered the gene pool of African elephants in the process.
In Gorongosa National Park in Mozambique, 90 per cent of elephants were slaughtered between 1977 and 1992, during the country’s civil war. Dr Poole said that because poachers disproportionately targeted tusked animals, almost half the females over 35 years of age have no tusks, and although poaching is now under control and the population is recovering well, they are passing the tuskless gene down to their daughters: 30 per cent of female elephants born since the end of the war also do not have tusks.
“Females who are tuskless are more likely to produce tuskless offspring,” she said.
In 2000, the BBC broadcast an hour-long documentary called Five Steps to Tyranny, a look at how ordinary people can do monstrous things in the presence of authority.
Horrific things happen in the world we live in. We would like to believe only evil people carry out atrocities. But tyrannies are created by ordinary people, like you and me.
[Colonel Bob Stewart:] “I’d never been to the former Yugoslavia before in my life, so what actually struck me about the country was how beautiful it was, how nice people were, and yet how ghastly they could behave.”
The five steps are:
“us” and “them” (prejudice and the formation of a dominant group)
obey orders (the tendency to follow orders, especially from those with authority)
do “them” harm (obeying an authority who commands actions against our conscience)
“stand up” or “stand by” (standing by as harm occurs)
exterminate (the elimination of the “other”)
To illustrate each step, the program uses social psychology experiments and explorations like Jane Elliott’s blue eyes/brown eyes exercise on discrimination, the Stanford prison experiment conducted by Philip Zimbardo (who offers commentary throughout the program), and experiments by Stanley Milgram on obedience, including his famous shock experiment, in which a participant (the “teacher”) is directed to shock a “learner” for giving incorrect answers.
The teacher is told to administer an electric shock every time the learner makes a mistake, increasing the level of shock each time. There were 30 switches on the shock generator marked from 15 volts (slight shock) to 450 (danger — severe shock).
The “learners” were in on the experiment and weren’t actually shocked but were told to react as if they were. The results?
65% (two-thirds) of participants (i.e. teachers) continued to the highest level of 450 volts. All the participants continued to 300 volts.
The program also shows how real-life tyrannies have developed in places like Rwanda, Burma, and Bosnia. From a review of the show in The Guardian:
But there is no doubt about the programme’s bottom line: tyrannies happen because ordinary people are surprisingly willing to do tyranny’s dirty work.
Programmes like this can show such things with great vividness — and there is news footage from Bosnia, or from Rwanda, or from Burma to back it up with terrible clarity. It isn’t clear why the majority is so often compliant, but the implication is that democracy should always be grateful to the protesters, the members of the awkward squad, the people who challenge authority.
But don’t take it for granted that the awkward squad must be a force for good: in Germany, in the 1920s, Hitler was an outsider, a protester, a member of the awkward squad. When he came to power in 1932, he found that German medical professors and biologists had already installed a racial ideology for him, one which had already theorised about the elimination of sick or disabled German children, and the rejection of Jewish professionals as agents of pollution.
Zimbardo himself offers this final word in the program:
For me the bottom line message is that we could be led to do evil deeds. And what that means is to become sensitive to the conditions under which ordinary people can do these evil deeds — what we have been demonstrating throughout this program — and to take a position of resisting tyranny at the very first signs of its existence.
NASA has published their highly anticipated and peer-reviewed analysis of the EM Drive and they’ve concluded the engine works despite appearing to violate Newton’s third law of motion.
In case you’ve missed the hype, the EM Drive, or Electromagnetic Drive, is a propulsion system first proposed by British inventor Roger Shawyer back in 1999.
Instead of using heavy, inefficient rocket fuel, it bounces microwaves back and forth inside a cone-shaped metal cavity to generate thrust.
According to Shawyer’s calculations, the EM Drive could be so efficient that it could power us to Mars in just 70 days.
But, there’s a not-small problem with the system. It defies Newton’s third law, which states that everything must have an equal and opposite reaction.
According to the law, for a system to produce thrust, it has to push something out the other way. The EM Drive doesn’t do this.
Yet in test after test it continues to work. Last year, NASA’s Eagleworks Laboratory team got their hands on an EM Drive to try to figure out once and for all what was going on.
There’s a lot of skepticism around this project, but NASA’s review is definitely a boost to the EM Drive’s credibility.
Update: Just to reiterate, even with this latest paper, there is still skepticism about the EM Drive.
In the end, we can’t conclude that this is a null result, nor can we excitedly say that it works. The sad truth is that this paper is not much better than the researchers’ last one, and it doesn’t actually have enough detail to let us fully evaluate the data. Nor does the paper have enough data to allow a conclusion in the absence of a model. And despite mention of a model in the paper, any model that exists is very well hidden.
Also a clue that the science isn’t quite there on this one yet: very few mainstream science outlets covered this. When the NY Times picks this up and gets prominent physicists on the record about the thruster’s promise, that’s when you’ll know something’s up. Until then, remain skeptical. (via @paudo)
In May of 1961, President John F. Kennedy told Congress and the rest of the American public that the US was going to send a man to the Moon. Just over 11 years later, as part of the Apollo 17 mission in December 1972, humans set foot on the Moon for the last time.1 The Last Steps is a summary of that final mission, during which NASA accomplished the near-impossible yet again and was met with increasing public indifference about a journey that had taken on the ease of a car trip to grandma’s house.
Update: Perhaps humans will set foot on the Moon sooner than 2060. The European Space Agency is planning on a manned mission “by 2030” and China is shooting for 2036. (via @T_fabriek)
Something is rotten to the north of Denmark. Climate scientists are alarmed at the extreme warmth in the Arctic right now. It’s currently dark up there 24 hours a day, which usually means cold temperatures and rapidly freezing ice. Instead, temperatures are rising…Arctic temps are currently a whopping 36°F above normal.
“The Arctic warmth is the result of a combination of record-low sea-ice extent for this time of year, probably very thin ice, and plenty of warm/moist air from lower latitudes being driven northward by a very wavy jet stream.”
Francis has published research suggesting that the jet stream, which travels from west to east across the Northern Hemisphere in the mid-latitudes, is becoming more wavy and elongated as the Arctic warms faster than the equator does.
“It will be fascinating to see if the stratospheric polar vortex continues to be as weak as it is now, which favors a negative Arctic Oscillation and probably a cold mid/late winter to continue over central and eastern Asia and eastern North America. The extreme behavior of the Arctic in 2016 seems to be in no hurry to quit,” Francis continued.
Is 2017 the year the Arctic finally loses most of the ice cap during the summer?
Soli is a newish project by Google described as “a new sensing technology that uses miniature radar to detect touchless gesture interactions”. It’s pretty cool. A group at The University of St. Andrews has found another potentially more amazing use for the sensor: recognizing specific objects and materials.
RadarCat (Radar Categorization for Input & Interaction) is a small, versatile radar-based system for material and object classification which enables new forms of everyday proximate interaction with digital devices. In this work we demonstrate that we can train and classify different types of objects which we can then recognize in real time. Our studies include everyday objects and materials, transparent materials and different body parts. Our videos demonstrate four working examples including a physical object dictionary, painting and photo editing application, body shortcuts and automatic refill based on RadarCat.
More simply put, if you put an orange on the sensor, it knows it’s an orange…and the system can learn new objects as well. It’s a barcode scanner without barcodes. Watch the video…you’ll get the idea pretty quickly.
Stanford biophysicist Manu Prakash is the inventor of the Foldscope, a small microscope that folds like origami, costs around a dollar, and provides “700 nanometer imaging”. Watch the video for examples — 700 nm is very small and the level of detail is incredible. Why do this? Prakash says:
It’s not just for scientists to figure out how the world works…We all start by being curious about the world. We are born with this and we really need to culture this, because fundamentally curiosity needs to be nurtured and kept alive forever.
You can read more about the Foldscope at the New Yorker or watch Prakash’s TED Talk.
He calls it the Foldscope, and it comes in a kit. (Mine arrived in a nine-by-twelve-inch envelope.) The paper is printed with botanical illustrations and perforated with several shapes, which can be punched out and, with a series of origami-style folds, woven together into a single unit. The end result is about the size of a bookmark. The lens — a speck of plastic, situated in the center — provides a hundred and forty times magnification. The kit includes a second lens, of higher magnification, and a set of stick-on magnets, which can be used to attach the Foldscope to a smartphone, allowing for easy recording of a sample with the phone’s camera. I put my kit together in fifteen minutes, and when I popped the lens into place it was with the satisfaction of spreading the wings of a paper crane.
You can’t currently buy a Foldscope but the website says that their Kickstarter campaign launches sometime this month, so stay tuned for that.
Update: You can now get your very own Foldscope on Kickstarter.
Some recent genetic testing of the blood of AIDS patients has determined that the strain of HIV responsible for the majority of the AIDS cases in the US spread from Zaire to Haiti around 1967, from Haiti to NYC around 1971, and from there to San Francisco around 1976 and that Gaétan Dugas (aka Patient Zero) was not responsible for setting the epidemic in motion.
The strain of H.I.V. responsible for almost all AIDS cases in the United States, which was carried from Zaire to Haiti around 1967, spread from there to New York City around 1971, researchers concluded in the journal Nature. From New York, it spread to San Francisco around 1976.
The new analysis shows that Mr. Dugas’s blood, sampled in 1983, contained a viral strain already infecting men in New York before he began visiting gay bars in the city after being hired by Air Canada in 1974.
The researchers also reported that originally, Mr. Dugas was not even called Patient Zero — in an early epidemiological study of cases, he was designated Patient O, for “outside Southern California,” where the study began. The ambiguous circular symbol on a chart was later read as a zero, stoking the notion that blame for the epidemic could be placed on one man.
A species of worm in the north-east Atlantic has been observed farming. They plant grass seeds in their burrows and feed on the sprouts when they start growing.
Ragworms (Hediste diversicolor) were thought to consume the seeds of cordgrass, an abundant plant in the coastal habitats where they live. But the seeds have a tough husk, so it was a mystery how the worms could access the edible interior.
Zhenchang Zhu at the Royal Netherlands Institute for Sea Research in Yerseke and his team have now discovered the worms’ surprising trick: they bury the seeds and wait for them to germinate, later feeding on the juicy sprouting shoots.
I, for one, welcome our new farming worm overlords.
Kurzgesagt shares a speculative bit of physics called vacuum decay that could very efficiently erase the entire Universe.
To understand vacuum decay, you need to consider the Higgs field that permeates our Universe. Like an electric field, the Higgs field varies in strength, based on its potential. Think of the potential as a track on which a ball is rolling. The higher it is on the track, the more energy the ball has.
The Higgs potential determines whether the Universe is in one of two states: a true vacuum, or a false vacuum. A true vacuum is the stable, lowest-energy state, like sitting still on a valley floor. A false vacuum is like being nestled in a divot in the valley wall — a little push could easily send you tumbling. A universe in a false vacuum state is called “metastable”, because it’s not actively decaying (rolling), but it’s not exactly stable either.
There are two problems with living in a metastable universe. One is that if you create a high enough energy event, you can, in theory, push a tiny region of the universe from the false vacuum into the true vacuum, creating a bubble of true vacuum that will then expand in all directions at the speed of light. Such a bubble would be lethal.
Such a process could already be underway, but don’t worry:
But even if one or multiple spheres of death have already started expanding, the Universe is so big they might not reach us for billions of years.
That’s a portion of the 2012 US Presidential election map of the southern states broken down by county: blue ones went Barack Obama’s way and counties in red voted for Mitt Romney.
But let’s go back to the Cretaceous Period, which lasted from 145 million years ago to 65 million years ago. Back then, the coastline of what is now North America looked like this:
Along that ancient coastline of a shallow sea, plankton with carbonate skeletons lived and died in massive numbers, accumulating into large chalk formations on the bottom of the sea. When the sea level dropped and the sea drained through the porous chalk, rich bands of soil were left right along the former coastline. When that area was settled and farmed in the 19th century, that rich soil was perfect for growing cotton. And cotton production was particularly profitable, so slaves were heavily used in those areas.
McClain, quoting from Booker T. Washington’s autobiography, Up From Slavery, points out: “The part of the country possessing this thick, dark and naturally rich soil was, of course, the part of the South where the slaves were most profitable, and consequently they were taken there in the largest numbers.” After the Civil War, a lot of former slaves stayed on this land, and while many migrated North, their families are still there.
The counties in which slave populations were highest before the Civil War are still home to large African American populations, which tend to vote for Democratic presidential candidates, even as the whiter counties around them vote for Republicans. The voting pattern of those counties on the map follows the Cretaceous coastline of 100 million years ago — the plankton fell, the cotton grew, the slaves bled into that rich soil, and their descendants later helped a black man reach the White House.
Jerry Coyne, University of Chicago professor and author of Why Evolution is True, shares the results of a recent paper called Detection of human adaptation during the past 2000 years. In the study, DNA sequencing was used to find human genes that have changed so quickly in the past 2000 years that the authors conclude natural selection must be responsible.
Now, however, we can, by DNA sequencing, look at DNA directly, and with some fancy statistical footwork, get an idea of which genes have changed in frequency so fast that they must have been due to positive natural selection. That’s the subject of a new paper in Science by Yair Field et al. (reference and free download below). The authors conclude that several traits, including lactose tolerance, hair and eye color, and parts of the immune system, as well as height, have evolved within the last 2,000 years.
Other genes that might have changed during that period include those for infant head circumference, insulin levels, birth weight, and female hip size.
Scientists at Oak Ridge National Laboratory have stumbled upon a process that uses “nanospikes” to turn carbon dioxide into ethanol, a common fuel.
This process has several advantages when compared to other methods of converting CO2 into fuel. The reaction uses common materials like copper and carbon, and it converts the CO2 into ethanol, which is already widely used as a fuel.
Perhaps most importantly, it works at room temperature, which means that it can be started and stopped easily and with little energy cost. This means that this conversion process could be used as temporary energy storage during a lull in renewable energy generation, smoothing out fluctuations in a renewable energy grid.
This sounds like a big deal…is it now possible to limit the effects of climate change by sinking carbon while also placing less dependence on fossil fuels? Here’s the Oak Ridge press release. That this news is almost a week old already and we haven’t heard more about it makes me a bit skeptical as to the true importance of it. (Of course, CRISPR is potentially a massive deal and we don’t hear about it nearly enough so…)
Update: A relevant series of tweets from Eric Hittinger on “why creating ethanol from CO2 cannot solve our energy or climate problems”. Wasn’t fully awake when I posted this apparently because, yeah, duh. (via @leejlh)
Small Spanish publisher Kronecker Wallis is doing a Kickstarter campaign to print a well-designed version of Isaac Newton’s Principia, one of the most important texts in science.
We have spent several months working on a desire. The desire to have a new edition of Isaac Newton’s Principia in our hands that is on a par with the importance of the text and of modern editorial design. To put it back on our shelves so that we can leaf through it from time to time and feel the pages beneath our fingers.
An opportunity has now arisen. Taking advantage of the fact that the original publication is to celebrate its 330th anniversary in 2017, we wish to republish it with an editorial design that pays attention to every last detail.
I am enjoying this trend of reviving old classics through the lens of modern design and packaging; see also the NYCTA Graphics Standards Manual, the NASA Graphics Standards Manual, and the Voyager Golden Record.