CT scans enable doctors to see 3-D X-ray images of inside the body. Now, artificial intelligence (AI) algorithms are successfully reading CT scans to spot bones at risk of breaking – even if the scan was originally taken to look for something completely different.
Spine fractures are a symptom of osteoporosis, a condition that makes bones more fragile and likely to break. Often, patients with this disease can suffer fractures without even noticing. However, it’s important to spot them and begin treatment as early as possible, before they lead to bigger issues and more broken bones.
Nurses in Oxford, United Kingdom recently used the Zebra Imaging Analytics Engine to re-analyze the CT scans of nearly 5000 patients. They were all classified as either positive (signs of fracture) or negative (no fracture). The nurses verified each result and found that the AI didn’t miss a single fracture. It did err on the side of caution though – about 30% of the scans that were reported as positive by AI were actually nothing to worry about. A similar study has also recently been done by researchers at Dartmouth College.
Overall, the software saves a lot of time for the nurses, as they can now just review the positive scans instead of studying every scan in detail. It has helped identify over 100 patients with previously undetected fractures. Thanks to AI, these people have been able to receive early treatment for osteoporosis, protecting them against broken bones caused by the disease.
Although great strides have been made in this field, treatment resistance is still a concern. Unfortunately, "acquired resistance" to first-line therapy is quite prevalent in patients, so more treatment options are still needed.
In a study recently published in the journal Scientific Reports, researchers from Kanazawa University in Japan tested whether two compounds found in coffee beans, called kahweol acetate and cafestol, could be used to treat renal cancer, after obtaining encouraging results regarding their usefulness against prostate cancer. The research group found that the two compounds together synergistically reduced cancer cell proliferation and migration. They also demonstrated that these two compounds reduced the expression of cell proteins linked to the transition from one cancer cell type to another, signaling between immune cells and cancer cells, and the prevention of programmed cell death (a process in which cells destroy themselves before they become cancerous).
These findings demonstrate that these two compounds, present in your morning coffee, have strong potential in the fight against renal cancer.
Cystic fibrosis is a genetic disorder that affects multiple organs like the lungs and pancreas. It is caused by a mutation a gene called CFTR, which results in the production of a dysfunctional CFTR protein. This protein helps balance salt and water within a cell by acting as a channel for chloride. A mutation in the CFTR protein causes dehydration of mucus secretions and an excessive loss of salt in sweat (salty skin). As a result, some people with cystic fibrosis experience mucus clogs in their airways and are susceptible other complications such as respiratory failure, inflammation, and infection.
In the US and some other developed countries, the initial diagnosis for cystic fibrosis involves measuring specific protein levels from dried blood spots or DNA-based mutation testing. However, these tests are invasive and don't always produce accurate results. Cystic fibrosis can be also diagnosed by testing a person's sweat, to measure their chloride levels and determine whether they have the dysfunctional CFTR protein.
But, collecting enough sweat to do the tests can be a problem. To address this, the researchers behind a new study published in Science have developed a gentle “sweat sticker” that can be used to accurately assess chloride levels outside of clinical and hospital settings. It uses microfluidic technology to rapidly collect chloride levels in a person's sweat, and chloride levels can be analyzed from images captured with a smartphone camera to provide a diagnosis. This relatively simple yet elegant system remains to be tested in a large group of people (this study only had 51 participants), but could make diagnosing cystic fibrosis much easier in the future.
Big congratulations to Jeff Bezos, who rode torturous working conditions for his employees, an avalanche of monopolization that put small business into the dirt, and a rocket ship that looks like a penis into 10 minutes in low-Earth orbit.
Bezos and his space tourism company, Blue Origin, see this as the first step towards mining space for resources that humans can use on Earth. As reported in Politico, Bezos got this bad, utopian idea from a Princeton professor Gerard O'Neill, whom Bezos met as a student.
Bezos is not alone in promoting grandiose ideas for sustaining human existence while also enriching himself. Elon Musk has a whole brand built on this sort of thing. He also wants to build a Mars colony. Mars, by the way, is an unlivable deathtrap.
There are really only two goals for futurist-capitalists like Bezos and Musk. One is to colonize other planets for human habitation after Earth has been made unlivable. The second is mining planets, asteroids, and comets for water and metals — an idea I can't believe anyone takes seriously. Take the problem of water: Water scarcity is an issue on Earth because humans are catastrophically bad at using it efficiently, even when we're not simply dumping feces and industrial pollution into it. While there are certainly water crises on Earth, the solution is not launching to space and mining ice from an asteroid with technology that doesn't exist. It needs to be managed, kept clean, and made available, but water is here. Earth has water.
Nearby asteroids don't. The grand total of asteroids that are even conceivably within grasp of any kind of mining is 28. An estimate of all near-Earth asteroids' freshwater supply, about 20,000 asteroids, calculated that they collectively contain between 100-400 billion gallons of water. That is approximately the amount of water the United States uses in one day.
There are no answers for humanity's current crises in space. I live in Minneapolis, a city famous for brutal winters and tolerable summers. It's been above 90oF for about eight weeks straight now, setting multiple local temperature records. Is Bezos going to find a new climate out in space?
The only correct thing to do, instead of fly to space and play Buzz Lightyear, is fix the only planet we have. All the things wrong with Earth now — catastrophic heat, deadly floods, droughts that arrive like accelerating clockwork — can still be fixed. There is no need for doomerism or hopelessness or bonkers ideas about space. Focus on Earth.
It is extremely clear that Bezos, Musk, and their ilk don't have humanity's best interests at heart. It only makes sense that space colonization and mining wouldn't really help ease humanity's suffering so much as it would make them both richer. On Blue Origins website is a vision statement:
“In order to preserve Earth, Blue Origin believes that humanity will need to expand, explore, find new energy and material resources, and move industries that stress Earth into space."
This is nothing more than a tacit admission, from Bezos himself, that capitalism can't coexist with human life. Incredibly, I agree with him. But flying to space on their phallic rocket ships isn't going to help. That will just leave us with the problems – climate change, poisoned water, income inequality – that Bezos and the others profited off of. They've demonstrated they cannot responsibly reinvest their wealth — so we'll need to do it for them. The only just thing to do is tax those robber barons into destitution and never speak their names again. We can put that money to better use on Planet Earth.
Almost immediately at the start of the pandemic, it was clear that age was a substantial risk factor for experiencing severe COVID-19. But how aging impacts our immune function has been a difficult puzzle to solve.
To answer this question, researchers designed a new study to analyze genetic data from over 700,000 people identified from five biobanks in the United States, United Kingdom, Northern Europe, and Japan in a genome-wide association study. They focused specifically on age-related mosaic chromosomal alterations (mCAs), which are large DNA rearrangements including mutations like deletions or duplications of parts of the DNA, in white blood cells. These mCAs accumulate in our blood as we age and have been previously established as risk factors for blood cancers.
In this Nature Medicine study, the researchers found that mCAs were associated with a 170 percent higher risk of sepsis and a 40 percent increase in risk of respiratory infections. This increased risk was even higher among individuals who had previously been diagnosed with cancer.
The fact that mCAs were associated with higher numbers of infections makes sense: mutations that alter large parts of white blood cells' DNA limit the ability of these immune system warriors to fight against foreign pathogens that cause sepsis, the flu, and even COVID-19. And in an additional analysis of 871 people who had COVID-19 during the first wave of the pandemic in New York, the researchers found that 17 percent of severe cases had mCAs, compared to just six percent of mild cases.
This research highlights one of likely many links between age and infection-related risks. Identifying individuals with these genetic markers could prevent the severe disease outcomes that are likely in this group.
In 2019, 44 percent of older Americans reported playing video games at least once a month. Part of this trend is seen in the rising popularity of game-like brain training programs such as Lumosity (which alone boasts over 75 million users), which promise improvements in memory, attention, and decision-making skills. But are these claims backed up by research?
One early study found effects of working memory training on intelligence, sparking a field of research focused on potential training benefits. After initial promising results, subsequent studies failed to replicate these findings. Often studies find some evidence of “near transfer”, or a training boost to specific skills, but fail to see “far transfer”, or benefits to general cognitive performance.
A 2021 study set out to determine the effectiveness of brain training programs in over 8,000 online participants, including 1,000 people who reported being active users of a brain training program. If these programs are as effective as they claim, then these active users should outperform the other participants on tests of memory, verbal ability, and reasoning skills. The participants came from a variety of countries, education levels, genders, and ages, a major strength of this study. The self-reported brain trainers actively used at least one program, and had used programs for anywhere between two weeks and five years.
The researchers found no evidence of an effect of brain training. Active brain trainers did not perform better on any cognitive measure than people who do not use these programs. Furthermore, no effect was found for any demographic group, such as age, education or socioeconomic status, or specific brain training program, further bolstering the conclusion that these programs are not effective.
The researchers found one significant result: people who believed that brain training was effective, regardless of whether they actually used them or not, counterintuitively performed worse on cognitive tests compared to people who didn’t believe these programs are effective. Whether or not people believe these games work, they seem to have little benefit to general cognitive function. Play games for enjoyment, not with any expectation of a major cognitive boost.
The floods were caused by an extreme rain event, where nearly twice the amount of rain that the region usually sees in a month fell in just two days. This disaster should drive home the point that climate scientists have been frantically trying to communicate: Climate change is happening now.
There may well be more floods to come. A paper published in Nature last year examined flood data for Europe from the past 500 years. The scientists, members of 34 different research groups, found that the past 30 years belong to one of the most flood-rich time periods in Europe, one of just nine such periods over the past five centuries. They also discovered that, while the previous eight flood-rich periods occurred during relatively cold periods, the most recent one is markedly warmer (by about 1.4 °C) than all of the others.
While the researchers did not explicitly attribute this current flood-rich period to climate change, they did highlight its "exceptional nature." As environmental journalist Andrew Revkin pointed out on Twitter, the reason this flood-rich period is so dangerous is that Europe is more developed and populated than it was over the past five centuries. Eighty-three million people live in Germany alone, and while the monetary damage has not yet been calculated, only about 45 percent of buildings are the country are insured against rain and flooding.
The flooding is also a reminder that climate change is affecting, and will continue to affect, the whole world. Yes, even the Global North. Everywhere. For instance, while the German floods have dominated the news, Oman is also seeing unseasonable rainfall and flooding that wiped out farmers' crops and disrupted the Eid Al Adha holiday.
We are currently way behind fighting climate change on all fronts. It is clear, though, that we have two main and urgent tasks ahead of us: mitigation and adaptation. The impacts of climate change are already deadly serious – let's get to work.
Hiccups are annoying. To get rid of them, we rely on remedies that often feel more silly than effective, like breathing into a paper bag, holding our breath, and pulling on our tongue. Now, scientists have developed a device called the “forced inspiratory suction and swallow tool” (FISST) that stops hiccups, sans paper bags and tongue-pulling.
Hiccups are triggered when something irritates the nerves controlling your diaphragm, a large muscle nestled beneath your lungs that regulates respiration, causing it to spasm. Air rushes into your lungs as a result of these spasms, which causes your epiglottis, a flap of cartilage that covers your windpipe during swallowing, to quickly close. This produces the audible “hic” that accompanies a hiccup.
The FISST consists of a drinking tube with a mouthpiece and a pressurized valve at the bottom — essentially a glorified straw. Users place the FISST into a glass of water, drink, and swallow. This suction and swallow sequence stimulates diaphragmatic contraction and epiglottis closure to end an hiccup episode. When researchers gave 249 people who reported having hiccups at least once a month a FISST and asked them to rank its effectiveness compared to home hiccup remedies, they found that the FISST stopped hiccups in nearly 92 percent of cases. People were also happier with the FISST than their go-to home techniques.
While these results are subjective, they provide encouraging evidence that the FISST relieves hiccups, and form a basis for assessing its efficacy in clinical trials down the line. If the FISST works as well as this study suggests, it could be a game-changer for folks experiencing transient and chronic hiccups alike.
Known as Betelgeuse’s Great Dimming, the star appeared only ¼ to ½ as bright as usual, a much bigger change than usually observed in any normal star. For an old supergiant star like Betelgeuse, this is suspicious — astronomers first thought that this change could be a harbinger of the star’s death, an indicator that it might explode into a supernova soon. But new research published in Nature just uncovered the true culprit behind the dimming: dust.
So while the Great Dimming was not, in fact, a signal of the star’s imminent death, that doesn’t mean Betelgeuse is guaranteed not to explode anytime soon. And when it does, it’ll surely be a grand show in the night sky.
What would an RNA molecule today have to say about the origins of life? We live in a world where cellular life is dominated by DNA, but this wasn’t always the case. The Origins of Life…Again is a speculative look at the future from the perspective of an RNA molecule if she was able to take agency for her own destiny. Instigated by an NSF funded project that is using synthetic biology to investigate the origins of life — RNA imagines a future based on the past, one that leads to insight on RNA-based viruses, the limits of fully synthetic genomes, and potential extraterrestrial life.
We have synthesized functional genomes of viruses, bacteria and simple celled organisms, but are we able to replicate life that no longer exists on this planet? Before DNA became indispensable to cellular life, there was an RNA world in which RNA performed all the functions, produced all the proteins necessary for transmission, replication, and evolution, aka life. RNA can even do the work of proteins...without proteins. Creating an RNA-based organism in the lab that self-replicates would shed light on how we transitioned into our DNA-based world.
This is exactly what our RNA character is investigating as she shuns her repetitive messenger job within the DNA factory to engineer her own likeness. RNA is inspired by the past - a rollercoaster world full of possibilities — as a way to build a new future. Can RNA create an entirely new form of life using new rules, and what does that mean for biology?
If successful, this will (hypothetically?) be the first time in billions of years that cellular life with an RNA chromosome will grace the surface of the Earth. Fully synthetic genomes, including artificial genomes that go beyond what could evolve in known life, will enable us to answer questions about life’s origins and to extend the rules that set life’s limitations.
To animate is to bring to life and animation is a lot like synthetic biology — both have near infinite creative capacity under the guidance of a few rules and certain tools. To match the transformative potential of the research, we took a meta angle and wondered what life itself would think of the origins of life. In creating a figurative universe it’s possible to envision new hypotheses and subvert traditional metaphors within synthetic biology. Metaphors always break down at some point, and the more radical a proposal, the quicker they crumble.
The original research project delves into the cultural aspect of science from the outset and includes an ethics and rhetoric component, pieces to be explored in future animations.
It’s hard to imagine Earth without land plants. Yet, terrestrial environments were plant-less for the first 3.5 billion years of Earth’s history. Plants transitioned to terrestrial life as early as 432 million years ago. The benefits of moving to land for plants probably included more light and carbon dioxide for photosynthesis. The first land plants faced challenges inherent to their new lifestyle; they had to adapt to drying out, and lower nutrient conditions and higher UV radiation than they encountered underwater. However, primordial plants had some help in overcoming these new challenges.
Today, many terrestrial plant species grow associated with mycorrhizal fungi, which attach to plant roots and facilitate plant water and nutrient uptake. One study found that 80 percent of plants surveyed had these fungi. Many plants depend on fungal partners for successful growth. In turn, the plant provides its fungi with sugars for food and lipids which form the structure of its cell membranes. According to DNA and fossil evidence, these symbiotic relationships are ancient, and they are hypothesized to have been essential in allowing ancestral plants to colonize land. Now, a new study published in Science provides the first experimental evidence that supports this hypothesis.
The scientists reasoned that if the symbiosis between mycorrhizal fungi and land plants is an ancestral (simply, very old) trait, extant land plants should share a response to mycorrhizal fungi that was inherited from their common ancestor. Conversely, if the relationship with mycorrhizal fungi developed more recently, different types of plants should have different responses to mycorrhizal fungi. The researchers compared how a species of liverwort, a primitive terrestrial plant group, and flowering plants responded to a mycorrhizal fungus.
Their experiments revealed that liverworts and flowering plants share genes that respond similarly to mycorrhizal fungi. These genes are involved in the production of plant hormones, infection responses, and the transfer of lipids, which were identified as essential in driving this symbiosis. The results show that primitive land plants respond to mycorrhizal fungi in the same way as flowering plants, supporting the hypothesis that symbiotic relationships between plants and mycorrhizal fungi are ancestral traits that facilitated colonization of land.
Depression is one of the most common mental health disorders; researchers estimate over 264 million people worldwide have the disease. And, between 10-30 percent of people diagnosed with clinical depression are unable to find relief even after multiple rounds of treatment with antidepressants.
To find a therapy for people diagnosed with treatment-resistant depression, researchers have been testing some unconventional drugs. These include the clinical anesthetic ketamine, as well as the active ingredient in magic mushrooms, psilocybin. Now, we can add laughing gas to the list.
A paper recently published in Science Translational Medicine reports results from a small, early-stage clinical trial conducted by researchers at the University of Chicago and Washington University School of Medicine. They found that inhaling a mixture of oxygen and nitrous oxide, the active chemical in laughing gas, significantly improved depression symptoms compared to inhaling oxygen alone in people diagnosed with treatment-resistant depression.
Larger studies will be necessary to validate these results. Nonetheless, early indications are that laughing gas may offer new hope for people diagnosed with treatment-resistant depression.
If you’ve ever lived with dogs, or raised a puppy, you’ve probably seen them excitedly sink their teeth into a stick. Traditionally, we’ve brushed it off as just another canine instinct or behavior, much like shooting us puppy dog eyes or licking themselves. But what if chewing on sticks is actually a sign of dogs’ intelligence?
For a long time, scientists assumed that just a handful of animals, including many primates and crows, used tools. In fact, tool use was seen as a marker of advanced evolution, a sign that we are smart enough to adapt our environment to our needs. A pair of researchers at Kyoto University want to include dogs among the ranks of toolmakers, and their findings have the potential to change how we think about animal intelligence.
James Brooks and Shinya Yamamoto carefully observed dogs chewing on sticks, and asked themselves why this behavior is so common. They posit that dogs purposefully use sticks to clean their teeth, and that stick chewing could relieve teething pain in puppies, much like we humans give our babies teething rings, and note that the way dogs hold their sticks in their paws suggests they’re potentially thinking through how to manipulate objects in space. This fits the definition of tool use.
Brooks and Yamamoto recommend further studies to see if dogs seek out sticks to chew on more often when they have other indicators of tooth pain or after different kinds of meals, and if more frequent stick-chewers have better dental health later in life. They also suggest we view tool use in animals as a spectrum, and their research raises questions about animal behaviors that might otherwise be overlooked as mere instinct. In other words, dogs and their sticks might just be showing us that animals are deliberate in their interactions with their environments.
Launching from Branson’s specially-built Spaceport America in the deserts of New Mexico, the Virgin Galactic spacecraft is designed primarily with the passenger experience in mind. Whereas other launches take off vertically from the ground, Virgin Galactic’s flights start more like a commercial airline on a runway. This is meant to be more comfortable and less jarring for passengers. A carrier airplane, dubbed Eve after Branson’s mother, brings the rocket ship off the ground from this runway takeoff.
Once at a high enough altitude, Eve releases the spacecraft Unity, which then fires its rocket engines to get to space. At the highest point in the flight, while the passengers are playing in zero gravity, Unity does a backflip, angling its windows towards Earth to provide them with spectacular views. In its descent, Unity acts like a glider, landing back on a runway, similar to how the NASA Space Shuttles landed. But if you’re hoping to take this flight, be aware that the price tag is pretty hefty: $250,000.
Unity also carries a small science payload to test the concept of “human-tended payloads,” where investigators bring their science with them to space. Crew member Sirisha Bandla is operating an experiment to capture snapshots of plant chemistry during the transition into and out of microgravity.
Virgin Galactic, founded in 2004, is one of a group of billionaire-led endeavors into spaceflight that have been in development for decades. While Elon Musk’sSpaceX has focused more on interplanetary travel, Blue Origin (founded by Amazon's Jeff Bezos) is currently Virgin Galactic’s main space tourism competitor. In fact, Branson even moved up this Virgin Galactic launch date in order to beat Bezos into space, a billionaire space race that has been criticized by many.
Branson’s dream of making space accessible is an admirable goal, the stuff of sci-fi stories. Although space isn’t yet available for everyone, today’s events are a first step towards that dream.
One of the perks of having a window seat in an airplane at night is looking out at the lights below. All that bright light underneath is actually a form of light pollution, or excessive artificial light. Like other forms of pollution, light pollution impacts both terrestrial and aquatic ecosystems. In fact, as of 2010, over 20 percent of Earth's coastlines were lit up artificially at night. As the human footprint on the planet continues to increase, the impact of light pollution on ecosystems remains a concern.
A recent study sought to understand the impact of artificial light at night by studying long-term effects of light pollution on juvenile orange-fin anemonefish, Amphiprion chrysopterus, within coral reefs of French Polynesia. They raised wild-spawned fish in the lab, and released them either artificially lit coral reefs, or reefs under natural conditions, then monitored their survival for nearly two years.
The researchers found that exposure to artificial light caused a 36 percent decrease in fish survival and growth, due to the increase of predators due to artificial light and its impact on fish physiology. This study highlights the need to further understand the impacts of light pollution on ecosystems, with the hope that solutions can be proposed in order to limit the impact of human activities on the natural ecosystems around us.
Ants are a particularly numerous group of animals — there are approximately 13,000 named species of ants in the world — and they can be found almost everywhere.
Their evolutionary success is frequently attributed to their division of labor and cooperation during foraging. Ant queens and males are mainly involved in reproduction and have wings, while ant workers are generally wingless and are adapted to ground labor. Ant workers show an almost Herculean strength; the Asian weaver ant can lift up to 100 times its body weight.
A team of researchers wanted to understand the morphological reason for this strength. A previous study on the anatomy of queens and workers from different species of ants found that worker ants' thoraxes (the part of their bodies between the neck and abdomen) have larger muscles on the first thoracic segment than queens, making their necks stronger and more mobile.
Now, their new study using high resolution X-ray analysis discovered specific changes in their thorax that are different from other flightless insects. The muscles involved in the movement of worker ants' necks, legs, and abdomens are stronger and have more support points — allowing them to carry heavy weights on their head while walking and running and to move their sting with precision. Such enormous strength may help explain their ecological success, despite the fact that they can't fly.
It would be inconvenient if we couldn’t remember the people we have or haven’t met before. Social recognition, the ability to differentiate familiar or novel individuals of the same species is part of a larger process of social memory that allows groups within a species to build and maintain stable networks or relationships, like what we know as friend groups or communities.
The hippocampus, known for its role in memory, is divided into subregions that contribute to different memory processes, and one called CA2 is particularly important for social memory. . Enkephalin, a neuropeptide that interacts with opioid receptors, is needed in CA2 to recognize new people.
Enkephalins belong to a class of opioids produced by the brain which are often associated with stress response and pain relief. The researchers found that in CA2, these compounds are released by specific type of neuron, boosting information transfer to the CA2, thus enabling our brains to form social memories.
Scientists studied the effects of enkephalin through a social memory test in mice. They introduced one mouse to a space with two others, and the subject mouse was allowed to interact with each mouse for fiver minutes. The subject mouse was removed, then returned half an hour later, this time with one of the mice from the last entry and one mouse it had not met before. The typical response for mice in this case is to pay attention to the new mouse for longer. The scientists observed that, while mice with regular enkephalin levels sniffed out the new mouse for a longer amount of time, mice without enkephalin spent the same amount of time between both mice, as if they had not previously encountered one of them.
A better understanding of social memory can help demystify related diseases. Schizophrenia, a condition in which social memory is impaired, is treated with drugs affecting opioid receptors, for example. The results of this study shed light on how these treatments work.
Electric catfish are the Nile River's most wonderous fauna. The fish’s ability to generate high-voltage electric fields fascinated ancient Egyptians, who and .
Advances in the human understanding of electricity helped to explain the nature of an electric catfish’s shocks and to identify the specialized electric organs that produce them. More recent advances in genomics have helped elucidate of those amazing organs. Still, despite our millennia of familiarity and centuries of modern scientific study, there’s plenty left to learn about the electric catfish. In particular, are the fish immune to their own shocks?
Georg Welzel and Stefan Schuster from the University of Bayreuth in Germany recently published aimed at that very question. They compared the responses of electric catfish and goldfish to different electrical stimuli, observing the movements of the fish after exposure to electrical discharges from both another electric catfish and electrofishing electrodes. While the goldfish were greatly affected by electric shocks from electric catfish and completely immobilized by the electrodes, the electric catfish appeared to be completely unfazed by any shocks.
Although this study showed that electric catfish are immune to their own shocks, exactly how they achieve that immunity remains unclear. The fish did not physically respond, so their bodies may be insulated against or tolerant to electricity. Regardless of which mechanism they use, these catfish have yet to lose their mystery or magic.
Looming more than four kilometers above sea level, the Tibetan plateau is both the largest and highest plateau on Earth. Home to two of the world’s tallest peaks, Everest and K2, the “Roof of the World” owes its literally breath-taking topography to the geological equivalent of a car crash between the Indian and Eurasian plates — a collision that continues to this day, causing earthquakes and occasionally forcing a revision of Mt. Everest’s official altitude.
But while scientists mostly agree on the broad strokes of Tibet’s chaotic formation, the details — specifically whether or not the plateau grew taller after its initial formation — have remained something of a geologic riddle.
Reconstructions of plate movements and stratigraphic evidence suggest that it did, potentially shooting up abruptly between 20 and 10 million years ago and rising a bit more gradually after that. But when scientists used the Tibetan fossil and isotope records to reconstruct the paleolatitude of the region, they found no evidence of elevation gain. Indeed, according to fossil evidence, Tibet might even have sunk by up to a kilometer
Now, University of Copenhagen geologist Giampiero Iaffaldano thinks he’s found a way to reconcile the apparently conflicting evidence.
To retrace the geologic past of the “Roof of the World,” Iaffaldano looked down to the ocean floor. Seafloor rock preserves snapshots of the Earth’s magnetic field captured at seafloor spreading centers — places where hot rock from the subsurface rises to become new seafloor. Those snapshots can be used to reconstruct the movement of the Earth’s crust in the distant past, and Iaffaldano used them to constrain India’s motion during Tibet’s formation.
With a better idea of how plate motions unfolded over the last tens of millions of years, Iaffaldano was able to calculate how much force the Indian plate may have experienced as it rammed into Eurasia. By comparing his result to other scientists’ estimates of the amount of force needed for altitude increase, he determined that Tibet probably did rise — just not by very much.
Critically, the modest altitude gain Iaffaldano suggests — just a few hundred meters — wouldn’tbe enough for paleoaltimetry records to accurately resolve. If he’s right, both lines of apparently contradictory evidence for Tibet’s ancient altitude can be neatly accommodated into one unified story.
Earlier this year, Google released an artificial intelligence-based dermatology app called Derm Assist. Based off pictures alone, it is capable of recognizing 288 different skin conditions — with one big caveat: The app, developed out of a 2020 published in Nature Medicine,was built on a 64,387-image database heavily biased toward images of white and light brown skin.
In fact, only 3.5 percent of people in the images used to train the algorithm had V and VI, which include brown, dark brown, and black skin. Most of the images in the database belonged to people with fair skin, darker white skin, or light brown skin, according to the study.
So if you have dark or black skin, the app is likely to overdiagnose or underdiagnose your skin. This isn't surprising, based on Google's recent history. The company made news earlier this year by unceremoniously firing artificial intelligence ethics researchers and . It's clear that Google doesn't want to put in actual effort into developing ethical apps and artificial intelligence. The company itself is only 3.7 percent Black, and just 1.6 percent of its employees are Black women, according to a .
As much as we like to think that medicine and health are objective, they aren't. For example, people who are Black or Latinx were several times more likely to die of COVID-19 than white people, and and Black people are less likely to be treated by a cardiologist while in an intensive care unit forgo heart failure than white people. Google continues to perpetuate these inequalities through their research applications.
University of Waterloo
Water filtration is an important step in drinking water infrastructure and wastewater treatment. But filters don't last forever — bacteria can attach to filtration membranes (structures that separate contaminants from water) and form in a process called biofouling. Biofouling reduces membrane lifetime and water quality.
Water filtration membranes often have a mesh, called a spacer, that separates different layers of the membrane from each other. Bacteria can attach to this spacer. One way to reduce bacterial adhesion to the spacer is by making it water repellent, or superhydrophobic. In a published in ACS Applied Bio Materials, scientists used candle soot to create superhydrophobic membrane spacers and keep biofouling cells away.
Researchers from the Zuckerberg Institute for Water Research in Israel coated the filtration spacer with a chemical called polydimethylsiloxane. They then held the spacer over a candle flame until it was covered with particles of soot. To test the effectiveness of the spacer, the researchers treated them with two species of bacteria and one species of .
The common bacterium , and the salt water species Cobetia marina and Navicula perminuta could not form biofilms on the soot covered spacers, unlike on uncoated spacers. These results demonstrate a simple way of creating biofouling-resistant membrane spacers cheaply using household candles. If this technique can translate to the water purification industry, superhydrophobic soot membranes could ead to less waste and lower filtration costs.
Paper wasps (Polistes fuscatus) are very good at recognizing and remembering individual faces. In the spring, sexually mature females, known as “foundresses,” race to secure a nest site which they may maintain either alone or alongside a coterie of co-foundresses with whom they share brood space. For a given foundress to cooperate with her allies and thwart potential usurpers, she must be able to recognize individual wasps as distinct entities.
The most thoroughly studied populations of paper waspsare those in and around Ann Arbor, Michigan and Ithaca, New York. Wasps from both locations show a striking amount of diversity in facial markings and possess the ability to learn and remember individual faces. Recently, a new population was discovered in Rothrock, Pennsylvania in which individuals seem to lack the highly variable face patterning present in the NY and MI populations. Is this observation an indication that this population lacks the ability to recognize individuals in the way that other populations do?
In their study, Elizabeth Tibbetts and her team of researchers from the University of Michigan found that the Pennsylvania population does exhibit far less variation in facial markings than the Michigan wasps. By measuring social interactions between familiar and unfamiliar social partners, they discovered no evidence that the Pennsylvania wasps remember other individuals. Furthermore, when subjected to a learning assay, the Pennsylvania population appeared to be incapable of learning to distinguish faces while the Michigan population learned to do so very quickly. They also demonstrated that Pennsylvania population was genetically distinct from the Michigan population, which they attributed to the geographic distance between them.
It is unclear whether or not the Pennsylvania population has lost the high level of facial pattern variation and individual recognition that has made P. fuscatus famous, or failed to acquire it. What is clear, however, is that paper wasp communication systems are capable of rapid evolution and can vary even within a species.
Every autumn, monarch butterflies migrate magnificently from northern America and Canada down to the Oyamel forests of Mexico. The butterflies congregate on Oyamel fir, or ‘sacred trees’, so densely that their collective weight can break off branches. Protecting Oyamel forests is critical to protecting monarchs.
However, protecting the Oyamel forest protection is complicated, as illustrated by a study recently published in the journal World Development. The study investigated the complex and dark network beneath the Monarch Butterfly Biosphere Reserve (MBBR) by conducting semi-structured interviews with locals, government workers, and NGO workers. It found that cartel members often log trees from monarch habitat, then work in concert with corrupt government officials, who authorize the conversion of the newly deforested land into avocado plantations.
The study also highlighted a paradoxical and important concept in ecosystem conservation: that of socioecological frontiers, which are a novel system of human-environment interactions. The MBBR was established to protect Oyamel forest by making it a “people-free” zone, but this seemingly good intention has had negative impacts on local people. Their traditional ecological practices became prohibited, making the forest less healthy. Moreover, local people are caught in an oppressive web of market demands, government corruption, and cartel activity, which all dictate the use of a forest that was previously theirs to sustainably farm.
This study presents a nuanced look into the world of corruption in the MBBR. As an entity supported by UNESCO and the World Wildlife Federation, the reserve may seem innocuous and even admirable from the outside. However, even though it has good intentions, the MBBR may be allowing corrupt government and cartel members to work together to destroy monarch habitat, all whilst simultaneously marginalizing the Indigenous peoples within it.
What happens when a scientific paper is found to be fraudulent, plagiarized, or unreliable? After a potentially lengthy investigative process, the paper will be officially retracted and the journal will write a retraction notice to let readers know why the paper has been pulled. But retractions don’t make a paper disappear altogether. Retracted papers continue to get cited, spreading misinformation through the scientific literature.
This suggests that journalists and social media users, as well as scientists, need to be wary of retracted papers. Fortunately, there are tools that can help with this. For scientists the reference manager Zotero will flag retracted papers and warn you before you cite them, and for journalists or members of the public who don’t use a reference manager, searching scite.ai for the title of the paper will let you know if it is problematic.
Invasive mammalian predators threaten wildlife and even cause extinctions of their prey in many places around the globe. The impact of invasive mammalian predators on islands is especially strong, because many island species evolve in an environment free of predatory mammals, and lack antipredator behaviors. They become easy prey.
New Zealand is a good example of this; it is one of the countries with most bird extinctions due to introduced mammalian predators such as rats and weasels. As such, the country is invested in predator control using innovative techniques.
A new study conducted in New Zealand and published in Science Advances details how a group of researchers made use of the mammalian predators' keen senses of smell to fool them, by using "misinformation" in the form of fake prey scents. The experiment was designed to make predators (ferrets, cats and hedgehogs) less efficient at hunting using a paste made from the carcasses and feathers of quails, gulls, and chickens — three common bird species. The idea was to habituate the predators to smelling these birds without encountering them, thus tricking the predators into ignoring other bird smells as well.
The researchers exposed the predators to the smell of the paste for five weeks before native birds began to nest, then monitored their attacks on native bird nests for eight weeks after that. The experiment reduced the frequency of nest attacks and increased the number of eggs hatching 1.7-fold, at minimum doubling the odds of successful hatching during the experiment. Furthermore, using these numbers, the researchers modelled the potential population increases for native birds if the treatment was used for 25 years, and found that it could increase bird populations by 127 percent.
The experiment showed that using misinformation can affect predator behavior, making them lose interest in endangered species. Furthermore, the technique is cheaper than conventional lethal predator control methods such as trapping and poisoning.