kottke.org posts about science
In the last several months, semaglutide, a drug originally developed to help manage type 2 diabetes, has been in the news for its “breakthrough” weight loss abilities. This video from Vox is a good overview of what the drug does and the interest & controversy around it.
Both Ozempic and Wegovy, Ozempic’s counterpart approved specifically for weight loss by the FDA, are brand names of a drug called semaglutide. Semaglutide is one of several drugs that mimics a crucial digestive hormone called glucagon-like peptide 1, or GLP-1. It amplifies a process our bodies perform naturally.
GLP-1 is released in our intestines when we eat, and there are receptors for the hormone in cells all over the body. In the pancreas, GLP-1 promotes the production of insulin and suppresses the production of glucagon. This helps insulin-resistant bodies, like those with type 2 diabetes or obesity, manage blood sugar levels. In the stomach, GLP-1 slows gastric emptying, extending the feeling of being full. In the brain, GLP-1 suppresses appetite, which also promotes satiety and curbs hunger, so we eat less.
Jia Tolentino wrote a long piece about semaglutide for the New Yorker this week: Will Ozempic Change How We Think About Being Fat and Being Thin?
But, as I kept reminding Ozempic-curious friends, these medications were designed for chronic conditions, obesity and diabetes. For people who are dealing with those conditions, Ozempic appears to create a path toward a healthy relationship to food. For those who aren’t, it might function more like an injectable eating disorder. As the side effects make clear, it’s not a casual thing to drastically alter your body’s metabolic process, and there is no large-scale data about the safety of these drugs when taken by people who are mainly interested in treating another chronic condition, the desire to be thin.
Julia Belluz wrote a piece for Vox on Obesity in the age of Ozempic and Eric Topol wrote about The New Obesity Breakthrough Drugs.
Update: In the shuffle of the last few months, I’d missed reading Paul Ford’s piece about “the post-hunger age”, A New Drug Switched Off My Appetite. What’s Left?
I can see my anxiety mirrored in the wave of reactions starting to appear — op-eds, TV segments, people explaining why it’s good, actually, that the vast majority of those using this drug lose a quarter of their body weight. On social media, fat activists are pointing out that our lives were worthy even without this drug. The wave of opinion will not crest for years.
And that’s fair because this is new — not just the drug, but the idea of the drug. There’s no API or software to download, but this is nonetheless a technology that will reorder society. I have been the living embodiment of the deadly sin of gluttony, judged as greedy and weak since I was 10 years old-and now the sin is washed away. Baptism by injection. But I have no more virtue than I did a few months ago. I just prefer broccoli to gloopy chicken. Is this who I am?
Even outside the context of drugs, I find the tension between accepting who you are versus trying to change some behavior you find unappealing is challenging to navigate — it’s something that comes up in therapy a lot. (thx, anil)
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Folks, I told you that this was going to become a JWST fan blog and if you didn’t hear me the first time, consider yourself notified. NASA’s newest space telescope is still stretching its legs, but even back in its early days last summer, it captured this breathtaking near-infrared and mid-infrared image of a star preparing to go supernova.
The 10 light-years-wide nebula is made of material cast off from the aging star in random ejections, and from dust produced in the ensuing turbulence. This brilliant stage of mass loss precedes the star’s eventual supernova, when nuclear fusion in its core stops and the pressure of gravity causes it to collapse in on itself and then explode.
Images like these are useful for studying dust, which sounds a little boring but actually is fascinating (italics mine):
The origin of cosmic dust that can survive a supernova blast and contribute to the universe’s overall “dust budget” is of great interest to astronomers for multiple reasons. Dust is integral to the workings of the universe: It shelters forming stars, gathers together to help form planets, and serves as a platform for molecules to form and clump together — including the building blocks of life on Earth. Despite the many essential roles that dust plays, there is still more dust in the universe than astronomers’ current dust-formation theories can explain. The universe is operating with a dust budget surplus.
Currently imagining a sci-fi office dramedy about the dust budget surplus — someone over at HBO Max or Apple+ get on this.
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If you live in any sort of winter climate, you have, at one time or another, wrestled with the two great mysteries of cold weather life:
1. Why does 50°F in the fall make you want to bundle up while 50°F in the spring makes you want to go for a walk in short sleeves?
2. Why the hell do kids wear shorts during the winter or go without coats when it’s literally freezing out? Like seriously, what the hell?
This short video answers both questions with one magical substance: brown fat.
55 degrees in the summer feels colder than 55 degrees in the winter. And 55 degrees as an adult likely feels colder than 55 degrees as a kid. But it’s not just a feeling. It all has to do with how our bodies use fat - specifically brown fat, a lesser-known type of fat that can produce roughly 300 times more heat than any other tissue in the body.
Brown fat isn’t the type of fat that adds to our weight (that’s white fat). Brown fat has the sole purpose of being burnt for heating the body, and it’s extremely effective at that. It only appears in specific parts of the body: around the neck, spine, heart, and kidneys. (It clumps around major blood vessels, in order to warm the blood as it passes through the body.)
In brief: 1. We have more brown fat in the spring, and 2. Kids have more brown fat in their bodies than adults. Cool! (har har)
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You may have seen the online kerfuffle a few weeks ago about a study that was released recently that indicated that there was no evidence that masks work against respiratory illnesses (see Bret Stephen’s awful ideologically driven piece in the NY Times for instance). As many experts said at the time, that’s not what the review of the studies actually meant and the organization responsible recently apologized and clarified the review’s assertions.
In a typically well-argued and well-researched piece for the NY Times, Zeynep Tufekci explains what the review actually shows and why the science is clear that masks do work.
Scientists routinely use other kinds of data besides randomized reviews, including lab studies, natural experiments, real-life data and observational studies. All these should be taken into account to evaluate masks.
Lab studies, many of which were done during the pandemic, show that masks, particularly N95 respirators, can block viral particles. Linsey Marr, an aerosol scientist who has long studied airborne viral transmission, told me even cloth masks that fit well and use appropriate materials can help.
Real-life data can be complicated by variables that aren’t controlled for, but it’s worth examining even if studying it isn’t conclusive.
Japan, which emphasized wearing masks and mitigating airborne transmission, had a remarkably low death rate in 2020 even though it did not have any shutdowns and rarely tested and traced widely outside of clusters.
David Lazer, a political scientist at Northeastern University, calculated that before vaccines were available, U.S. states without mask mandates had 30 percent higher Covid death rates than those with mandates.
Randomized trials are difficult to do with masks and are not the only way to scientifically prove something. I’m hoping for an update that the entire premise of that Stephens piece is incorrect and will be removed from the Times’ website, but I don’t think it’s going to happen.
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In a 1959 talk entitled There’s Plenty of Room at the Bottom, physicist Richard Feynman casually invented nanotechnology, inviting the audience and then the world to imagine exploring and making use of the “inner space” of the micro and nano realms. In this video from Kurzgesagt, thye imagine how things would seem if you could somehow shrink yourself down to the size of a grain of sand or a molecule or even smaller, sort of a more educational (but still fun) Ant-Man and the Wasp: Quantumania.
You are the size of a grain of sand just 2 mm high, standing on a blade of grass that seems as tall as an eight storey building to you. A square meter of lawn is now a dense metropolitan area, with 100,000 blades, or two Manhattans worth of grass towers. From your new tiny perspective, the park that you could quickly stroll through before, is now the size of France. Crossing it would take at least a week. Human-sized humans loom over you, 4 times taller than the Empire state building, their steps falling from horizon to horizon.
A bee the size of a helicopter lands near you, making the ground shake, as its hairy carapace vibrates with each wingbeat. You try to escape but are barely able to move because the air is so… gooey. Before you clicked the button air resistance was barely noticeable — but as you’re now a thousand times smaller, it is as if the air has become a thousand times denser. It feels like you are moving through honey.
Flying insects like bees use this to their advantage. Their wings are not made for gliding but like paddles that row through the air. Scaled up to human size, the bee would outrun a Concorde Jet — except it couldn’t even take off because it would be too heavy for its wings.
See also Meet the Nano Sapiens, Scaling Laws and the Speed of Animals, The Biology of B-Movie Monsters, and Powers of Ten.
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I don’t know how kottke.org isn’t going to turn into a JWST-only blog — it seems like there’s some never-before-seen imagery released every other week that just absolutely knocks my socks off. Like these unprecedented images of nearby galaxies that were taken to help study how individual stars affect galactic structure.
The saying goes, ‘From a tiny acorn grows the mighty oak.’ This is accurate not just here on Earth, but in our solar system and beyond. Even on a galactic scale, where individual stars and star clusters can sculpt a galaxy’s overall structure. Scientists say NASA’s James Webb Space Telescope is perfectly primed to study these phenomena, and the first data is astounding astronomers.
New imagery from Webb’s Mid-Infrared Instrument is revealing never-before-seen details into how young, newly forming stars influence the structure of the gas and dust of nearby galaxies, and therefore how they evolve over time. Areas of galaxies that once appeared dim and dark in visible light, now under Webb’s infrared eye, are glowing cavities and huge cavernous bubbles of gas and dust.
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Well, this is potentially a huge deal:
In a potential game changer for the treatment of superbugs, a new class of antibiotics was developed that cured mice infected with bacteria deemed nearly “untreatable” in humans — and resistance to the drug was virtually undetectable.
Developed by a research team of UC Santa Barbara scientists, the study was published in the journal eBioMedicine. The drug works by disrupting many bacterial functions simultaneously — which may explain how it killed every pathogen tested and why low-level of bacterial resistance was observed after prolonged drug exposure.
Huge if true, etc. What really caught my attention is how they discovered this in the first place…they were working on a way to charge cell phones:
The discovery was serendipitous. The U.S. Army had a pressing need to charge cell phones while in the field — essential for soldier survival. Because bacteria are miniature power plants, compounds were designed by Bazan’s group to harness bacterial energy as a “‘microbial”’ battery. Later the idea arose to re-purpose these compounds as potential antibiotics.
“When asked to determine if the chemical compounds could serve as antibiotics, we thought they would be highly toxic to human cells similar to bleach,” said Mahan, the project lead investigator. “Most were toxic — but one was not — and it could kill every bacterial pathogen we tested.”
Here’s the original paper if you’d like to take a look.
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This is super-interesting: in papers written by Leonardo da Vinci collected in the Codex Arundel, he documents experiments that show that gravity is a form of acceleration and also calculated the gravitational constant to within 97% accuracy, hundreds of years before Newton formalized gravity in theory.
In an article published in the journal Leonardo, the researchers draw upon a fresh look at one of da Vinci’s notebooks to show that the famed polymath had devised experiments to demonstrate that gravity is a form of acceleration — and that he further modeled the gravitational constant to around 97 percent accuracy.
Da Vinci, who lived from 1452 to 1519, was well ahead of the curve in exploring these concepts. It wasn’t until 1604 that Galileo Galilei would theorize that the distance covered by a falling object was proportional to the square of time elapsed and not until the late 17th century that Sir Isaac Newton would expand on that to develop a law of universal gravitation, describing how objects are attracted to one another. Da Vinci’s primary hurdle was being limited by the tools at his disposal. For example, he lacked a means of precisely measuring time as objects fell.
As the piece notes, Leonardo didn’t get things exactly right:
Da Vinci sought to mathematically describe that acceleration. It is here, according to the study’s authors, that he didn’t quite hit the mark. To explore da Vinci’s process, the team used computer modeling to run his water vase experiment. Doing so yielded da Vinci’s error.
“What we saw is that Leonardo wrestled with this, but he modeled it as the falling object’s distance was proportional to 2 to the t power [with t representing time] instead proportional to t squared,” Roh says. “It’s wrong, but we later found out that he used this sort of wrong equation in the correct way.” In his notes, da Vinci illustrated an object falling for up to four intervals of time-a period through which graphs of both types of equations line up closely.
But it’s still pretty impressive how far he did get. The piece also notes that this work was discovered because the codex was made available online to the general public, demonstrating the value of easy access of materials like this.
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A group of astronomers say they have evidence that links supermassive black holes at galactic centers with dark energy, the mysterious force that accounts for roughly 68% of the energy in the universe. Here’s the news release and the paper. From the Guardian:
Instead of dark energy being smeared out across spacetime, as many physicists have assumed, the scientists suggest that it is created and remains inside black holes, which form in the crushing forces of collapsing stars.
“We propose that black holes are the source for dark energy,” said Duncan Farrah, an astronomer at the University of Hawaii. “This dark energy is produced when normal matter is compressed during the death and collapse of large stars.”
The claim was met with raised eyebrows from some independent experts, with one noting that while the idea deserved scrutiny, it was far too early to link black holes and dark energy. “There’s a number of counter-arguments and facts that need to be understood if this claim is going to live more than a few months,” said Vitor Cardoso, a professor of physics at the Niels Bohr Institute in Copenhagen.
And here’s a short video explainer:
It’s a radical claim to be sure — it’ll be interesting to see how it shakes out in the weeks and months to come as other scientists interpret the results.
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DNA and RNA get all of the headlines, but it’s not difficult to argue that much of the glorious complexity and possibility of life is due to proteins. In the latest episode of Kurzgesagt, they explain the role of cellular proteins in creating life.
You are cells. Your muscles, organs, skin and hair. They are in your blood and in your bones.
Cells are biological robots. They don’t want anything, they don’t feel anything. They are never sad or happy. They just are, right here, right now. They are as conscious as a stone or a chair or a neutron star. Cells just follow their programming that has been evolving and changing for billions of years, molded by natural selection.
They are impossible machines and yet, here they are, driven entirely by the fundamental forces of the universe. The smallest unit of life, right at the border where physics becomes biology.
Sometimes, to get a truer understanding of how amazing something is, you need to hold your breath and dive in really deep. So, what are cells and how do they work?
As always, you can see a list of their sources and further reading for the video.
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Thanks to a planet-wide collaboration, scientists have released an image of the Milky Way that contains 3.32 billion individually identifiable objects, most of which are stars.
Gathering the data required to cover this much of the night sky was a Herculean task; the DECaPS2 survey identified 3.32 billion objects from over 21,400 individual exposures. Its two-year run, which involved about 260 hours of observations, produced more than 10 terabytes of data.
Most of the stars and dust in the Milky Way are located in its spiral disk — the bright band stretching across this image. While this profusion of stars and dust makes for beautiful images, it also makes the galactic plane challenging to observe. The dark tendrils of dust seen threading through this image absorb starlight and blot out fainter stars entirely, and the light from diffuse nebulae interferes with any attempts to measure the brightness of individual objects. Another challenge arises from the sheer number of stars, which can overlap in the image and make it difficult to disentangle individual stars from their neighbors.
It’s worth checking out the largest size of the image published on the web (which is actually much smaller than the image’s actual size) as well as a tiny portion of the full image (second image above) that shows just how much detail is there. A zoomable interface for the entire image is available here.
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From Wikipedia contributor Cmglee and Astronomy Picture of the Day, a color-coded periodic table that displays which cosmic events — the Big Bang, exploding stars, merging neutron stars, etc. — was responsible for creating each element, according to our present understanding of the universe.
The hydrogen in your body, present in every molecule of water, came from the Big Bang. There are no other appreciable sources of hydrogen in the universe. The carbon in your body was made by nuclear fusion in the interior of stars, as was the oxygen. Much of the iron in your body was made during supernovas of stars that occurred long ago and far away. The gold in your jewelry was likely made from neutron stars during collisions that may have been visible as short-duration gamma-ray bursts or gravitational wave events.
The data for the table came from OSU’s Jennifer Johnson, who quotes Carl Sagan:
The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.
(thx, caroline)
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Zeynep Tufekci on the H5N1 strain of the avian influenza, which is showing some recent signs of spreading in mammals.
Bird flu — known more formally as avian influenza — has long hovered on the horizons of scientists’ fears. This pathogen, especially the H5N1 strain, hasn’t often infected humans, but when it has, 56 percent of those known to have contracted it have died. Its inability to spread easily, if at all, from one person to another has kept it from causing a pandemic.
But things are changing. The virus, which has long caused outbreaks among poultry, is infecting more and more migratory birds, allowing it to spread more widely, even to various mammals, raising the risk that a new variant could spread to and among people.
Alarmingly, it was recently reported that a mutant H5N1 strain was not only infecting minks at a fur farm in Spain but also most likely spreading among them, unprecedented among mammals. Even worse, the mink’s upper respiratory tract is exceptionally well suited to act as a conduit to humans, Thomas Peacock, a virologist who has studied avian influenza, told me.
The three relevant facts here are: 56% of humans who’ve contracted H5N1 have died, there are signs of spreading among mammals, and that particular mammal is “exceptionally well suited” to pass viral infections along to humans. Tufekci, who attempted to sound the alarm relatively early-on about Covid-19, goes on to urge the world to action about H5N1, before it’s too late. Will we act? (No. The answer is no.)
*sigh*
You know, it’s a little shocking to read about a potential solution to the Fermi paradox on a random February Monday, but here we are.
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South Korea currently has a probe called Danuri orbiting the Moon at an altitude of about 62 miles above the surface. It’s just begun its mission but has already sent back some black & white photos of the Moon and the Earth, including the two above. Over at EarthSky, Dave Adalian says these shots “rival the work of legendary nature photographer Ansel Adams” and it’s difficult to disagree.
Also worth a look: Danuri’s shot of the Earth and Moon from a distance, hanging in the blackness of space like a pair of pearls. (via petapixel)
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Magnets are cool. Full stop. The Magnetic Games channel has a ton of videos about all the neat stuff you can do with them.
I can’t be the only person who, after watching this, wants to spend a significant amount of money on neodymium magnets and magnetic putty? Some people do puzzles, others do Lego — maybe I could be a magnet guy?
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Clive Thompson, himself a person with a number of “weird, offbeat obsessions”, writes about the power of curiosity, including the story of how a trip to Yellowstone’s burbling hot springs led to the PCR method that enables accurate Covid testing.
Back in 1964, the microbiologist Thomas Brock visited Yellowstone National Park to do some sightseeing. He was on a long car ride, and wanted to break up the monotony.
While peering into the hot springs, he noticed a curious blue-green tinge. When he asked a park ranger about it, he was told it was algae. That surprised Brock: Those pools are so hot that some of them reach a boiling temperature. At the time, scientists didn’t know of many lifeforms that could readily thrive such scalding environments.
But Brock couldn’t stop wondering about what exactly was going on in those boiling pools. He was dying to know: What was alive down there? How was it surviving?
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Canada’s Bay of Fundy has the highest tides in the world, with a difference between low and high tides reaching more than 50 feet in some areas. That’s a lot of water in motion:
In a single tidal cycle of just over 12 hours, about 110 billion tons of water flows in and out of the Bay of Fundy. That sounds like a lot. To get a handle on just how much it is, it is equivalent to the combined total 24 hr flow of all the rivers of the world!
With that much flowing water, you should be able to generate a massive amount of hydroelectric power. But as Tom Scott explains in this succinct video, the problem is that there’s almost too much energy to harness — the tide is so strong that it just destroys turbines.
See also Bay of Fundy Extreme Tides Time Lapse.
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Creative coder Neal Agarwal has launched his newest project: Asteroid Launcher. You can choose the asteroid’s composition (iron, stone, comet, etc.), size, speed, angle of incidence, and place of impact. Then you click “launch” and see the havoc you’ve wrought upon the world, with all kinds of interesting statistics. I bombarded Los Angeles with an iron asteroid a half-mile across moving at 50,000 mph and the results were significant, as you can see from the fireball it created:
Some of the most interesting bits about the impact:
- The crater is 2,087 ft deep.
- Clothes would catch on fire within 86 miles of the impact.
- An estimated 4,343,300 people would die from the 249 decibel shock wave.
- Winds would reach 13,373 mph; within 105 miles it would feel like being inside an EF5 tornado.
Crikey! See also the description of the much more massive meteorite that slammed into the Yucatan peninsula 66 million years ago:
The meteorite itself was so massive that it didn’t notice any atmosphere whatsoever,” said Rebolledo. “It was traveling 20 to 40 kilometers per second, 10 kilometers - probably 14 kilometers — wide, pushing the atmosphere and building such incredible pressure that the ocean in front of it just went away.
And The World’s Loudest Sound:
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.
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From Maastricht University in The Netherlands, this is a fantastic animation of the lifecycle of the SARS-CoV-2 virus as it invades and then multiplies in the human lung. A more scientific version is available as well. Great explanation but I love the visual style of this. They used textures similar to stop motion animations — e.g. the proteins look like clay and the cell membranes seem to be made of felt. (via carl zimmer)
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It is Friday and this is the perfect Friday sort of post. BeamNG is a video game of sorts that’s “a dynamic soft-body physics vehicle simulator capable of doing just about anything”. In the simulator, you can quickly devise all sorts of situations with a variety of cars and then press play to see what happens, with (mostly) realistic physics and collisions. For instance, here’s Cars vs Big Bulge:
Chained Cars vs Bollards:
Cars vs 100 Fallen Trees:
Trains vs Giant Pit:
And many many more. My god if this simulator had been around when I was 12 years old, I might not have done anything else. Hell, if I downloaded and installed this right now, I might not ever get anything done ever again. (via @tvaziri)
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In retrospect, maybe today wasn’t such a good day to watch a video about how incredibly scary brain-eating amoebas are. But, as you might guess from the title, we don’t actually need to worry too much about them.
While the Naegleria fowleri is clearly extremely deadly and the infection truly horrible, there have only been a few hundred cases in the last few decades. You are way more likely to drown in a pool than to get infected.
A reminder that in our current media environment, calibrating personal risk can be challenging.
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On the 26th flight of Ingenuity, NASA’s helicopter on Mars, it spotted and photographed the wreckage of the Perseverance rover’s landing gear, protective shell, and parachute. From a NY Times article on the photos:
“There’s definitely a sci-fi element to it,” Ian Clark, an engineer who worked on Perseverance’s parachute system, said of photographs released on Wednesday. “It exudes otherworldly, doesn’t it?”
Part of the reason NASA had Ingenuity go take a look is to see how all of that equipment held up during the landing process. Data from the photos will inform future missions.
“Perseverance had the best-documented Mars landing in history, with cameras showing everything from parachute inflation to touchdown,” said JPL’s Ian Clark, former Perseverance systems engineer and now Mars Sample Return ascent phase lead. “But Ingenuity’s images offer a different vantage point. If they either reinforce that our systems worked as we think they worked or provide even one dataset of engineering information we can use for Mars Sample Return planning, it will be amazing. And if not, the pictures are still phenomenal and inspiring.”
In the images of the upright backshell and the debris field that resulted from it impacting the surface at about 78 mph (126 kph), the backshell’s protective coating appears to have remained intact during Mars atmospheric entry. Many of the 80 high-strength suspension lines connecting the backshell to the parachute are visible and also appear intact. Spread out and covered in dust, only about a third of the orange-and-white parachute — at 70.5 feet (21.5 meters) wide, it was the biggest ever deployed on Mars — can be seen, but the canopy shows no signs of damage from the supersonic airflow during inflation. Several weeks of analysis will be needed for a more final verdict.
It is really remarkable, the images we’re seeing from Mars, taken by a robotic helicopter.
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In the last installment of a video series called The Universe in Verse, Maria Popova, Yo-Yo Ma, and Kelli Anderson have collaborated on a video that features words spoken by Nobel Prize-winning physicist Richard Feynman in a 1955 speech, a poem of sorts on the wonder of life.
Deep in the sea, all molecules repeat the patterns of one another till complex new ones are formed. They make others like themselves… and a new dance starts.
Growing in size and complexity… living things, masses of atoms, DNA, protein… dancing a pattern ever more intricate.
Out of the cradle onto the dry land… here it is standing… atoms with consciousness… matter with curiosity.
Lovely. And of course I love the visuals by Kelli Anderson.
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You may have noticed, while twisting apart Oreos (aka the world’s favorite “trilayer laminate composite”) to get at the creme inside, that the creme tends to mostly stick to one half of the cookie. MIT graudate student Crystal Owens decided to study this phenomenon and has co-authored a paper about the failure mechanics of the Oreo’s layer of creme in the journal Physics of Fluid. From Ars Technica:
“I had in my mind that if you twist the Oreos perfectly, you should split the creme perfectly in the middle,” said Owens. “But what actually happens is the creme almost always comes off of one side.” The experiments showed that this creme distribution is not affected by rotation rate, the amount of creme filling, or the flavor. Rather, the pre-existing level of adhesion between the creme and the chocolate wafers seemed to be the determining factor. Cookies from the package within any one box typically separated with the same preferred orientation most of the time. This suggests that it has something to do with how the cookies are manufactured and then oriented during packaging, as well as how they are stored.
They even built a 3D printed “oreometer” so that people can study this phenomenon without using an expensive rheometer.
As a very amateur kitchen scientist myself, the Oreo situation reminds me of what happens when you try to tear three connected pieces of paper towel apart in one move by pulling on the outside pieces in opposite directions: the middle piece of paper towel almost always ends up attached to one of the outside pieces. In fact, in extensive testing over the past 3-4 years, this maneuver has only separated all three pieces a few times.1 (thx, eric)
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Wow, NASA just released a video shot by the Mars Perseverance rover of a solar eclipse by the moon Phobos. The video description calls it “the most zoomed-in, highest frame-rate observation of a Phobos solar eclipse ever taken from the Martian surface”. According to this article from JPL, the video of the eclipse is played in realtime; it only lasted about 40 seconds.
Captured with Perseverance’s next-generation Mastcam-Z camera on April 2, the 397th Martian day, or sol, of the mission, the eclipse lasted a little over 40 seconds — much shorter than a typical solar eclipse involving Earth’s Moon. (Phobos is about 157 times smaller than Earth’s Moon. Mars’ other moon, Deimos, is even smaller.)
Just a hunk of space rock passing in front of a massive burning ball of gas recorded by a robot from the surface of an extraterrestrial planet, no big deal.
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I had always heard that the engineering of Roman aqueducts was impressive, but as this video demonstrates, I didn’t know the half of it. The stuff about how precise the descending slope of the aqueducts were over several hundred miles is just incredible. (via open culture)
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Is there a physical limit to how loud a noise can be? As you might imagine, the answer is somewhat complicated, even if you assume normal atmospheric conditions. In video, Benn Jordan discusses a few possible answers, as well as how we should think about the question in the first place. One possible answer is 194 decibels, although experiencing a sound that loud would probably kill you.
See also The World’s Loudest Sound, aka the sound generated by the Krakatoa volcanic eruption in 1883, which Jordan mentions in the video.
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A new video from Kurzgesagt is designed to provide a little hope that humans can figure a way out of the climate crisis, without being overly pollyannish.
And so for many the future looks grim and hopeless. Young people feel particularly anxious and depressed. Instead of looking ahead to a lifetime of opportunity they wonder if they will even have a future or if they should bring kids into this world. It’s an age of doom and hopelessness and giving up seems the only sensible thing to do.
But that’s not true. You are not doomed. Humanity is not doomed.
There’s been progress in the last decade, in terms of economics, technology, policy, and social mores. It’s not happening fast enough to limit warming to 1.5°C, but if progress continues, gains accumulate, people keep pushing, and politicians start to figure out where the momentum is heading, we can get things under control before there’s a global apocalypse.
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The European Space Agency’s Solar Orbiter recently took 25 images of the Sun from a distance of 46 million miles that, when stitched all together, form the highest resolution photo of the Sun (and its corona) ever created.
The high-resolution telescope of EUI takes pictures of such high spatial resolution that, at that close distance, a mosaic of 25 individual images is needed to cover the entire Sun. Taken one after the other, the full image was captured over a period of more than four hours because each tile takes about 10 minutes, including the time for the spacecraft to point from one segment to the next.
In total, the final image contains more than 83 million pixels in a 9148 x 9112 pixel grid. For comparison, this image has a resolution that is ten times better than what a 4K TV screen can display.
You can zoom in on the image here to see how remarkably detailed it is.
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Using Lego bricks, a Raspberry Pi mini-computer, an Arduino microcontroller, some off-the-shelf components like lenses, and 3D-printed components, IBM scientist Yuksel Temiz built a fully functional microscope to help him with his work. The materials cost around $300 and the microscope performs as well as scopes many times more expensive — the images above were taken with the Lego scope.
The microscope works so well that for the past two years Temiz and his colleagues in the microfluidics lab at IBM Research, just meters away from the picturesque Zurich lake, have been using the images they took with it in their papers, published in leading journals. They also use them for presentations at major conferences. Not all images relate to microfluidics — the area of science that involves manipulating fluids on miniscule chips in a very precise manner. The liquids can be blood or urine, used for cancer and infectious diseases research as well as understanding heart attack conditions, and more. Researchers also routinely take images of typical computer chips, and Temiz showed me, for instance, how to take a stunning close up of a fruit fly.
Here’s a quick video look at how to build your own:
The the full set of open-sourced instructions are available on GitHub.
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