Great star corals in the grip of disease have been saved with probiotics — beneficial bacteria that attack or displace invading pathogens or possibly trigger immune responses to them. What’s causing this deadly disease remains unidentified. But researchers at the Smithsonian Marine Station in Fort Pierce, Fla., were able to successfully halt progression of the disease’s symptoms, the team reports June 5 in Frontiers in Marine Science. The condition is called stony coral tissue loss disease and is characterized by white lesions that lead to the loss of polyps — tiny soft-bodied organisms similar to sea anemones — blanketing coral. Eventually, nothing but the white coral skeleton is left behind. The disease emerged in Florida in 2014 and has spread rampantly throughout the Florida Keys and the Caribbean. A great star coralcolony is infected with stony coral tissue loss disease on the coral reef in Fort Lauderdale. The lesion, where the white band of tissue occurs, typically moves across the coral, killing coral tissue along the way. Kelly Pitts/Smithsonian Researchers suspect that the disease is bacterial in nature. Antibiotic treatments can offer a quick fix, but these drugs do not prevent reinfection and carry the risk of the mysterious pathogen building resistance against them. So, in late 2020, the Smithsonian group tried for a more sustainable solution, giving probiotics to 30 infected great star coral colonies. The helpful microbes came from corals tested in the lab that showed resistance to the disease. “We noticed that one of the coral fragments would not get infected … so one of the first things we did was try to culture the microbes that are on this coral,” says microbiologist Blake Ushijima, who developed the probiotic used in the team’s experiment. “These microbes produce antibacterial compounds … and one had a high level of activity against bacteria from diseased corals,” acting as a “pro” biotic, by somehow neutralizing pathogens. The identified microbe, a bacterium called McH1-7, became the active ingredient in a paste delivered by divers to several infected colonies. They covered these colonies with plastic bags to immerse them in the probiotic solution, injecting the paste into the bags using a syringe. They also applied the paste directly to other colonies, slathering lesions caused by the disease. A probiotic paste of McH1-7 is applied to the disease lesion of a great star coralcolony infected with stony coral tissue loss disease. The paste was then smoothed flat with a gloved hand so that all apparently infected tissue was covered by the lesion-specific treatment.Kelly Pitts/Smithsonian For two and a half years, the team monitored the corals’ health. The probiotics slowed or stopped the disease from spreading in all eight colonies treated inside bags. On average, the disease’s ugly advance was held to only 7 percent of tissue, compared with an aggressive 30 percent on untreated colonies. The paste put directly on the coral had no beneficial effect. The results are encouraging, but coauthor Valerie Paul cautions against declaring the probiotic a cure. She doubts the practicality of swimming around with heavily weighted plastic bags and putting them on corals. And, she points out, the study was limited to one species of coral, when the disease plagues over 30. Sponsor Message Still, Ushijima considers the study a proof of concept. “The idea of coral probiotics has been thrown around for decades, but no one has directly shown their effects on disease in the wild,” he says. “I think it’s very exciting because it’s actually opening the door to a new field.” #probiotics #helped #great #star #corals

A swirling sea of pink, where fluffy tufts float majestically upward, while elsewhere violet plumes rain down from above. This is the Sun as seen in groundbreaking new images — and they're unlike anything you've ever laid eyes on.As detailed in a new study published in the journal Nature Astronomy, scientists have leveraged new coronal adaptive optics tech to bypass the blurriness caused by the turbulence of the Earth's atmosphere, a time-old obstacle that's frustrated astronomers' attempts to see features on our home star at a resolution better than 620 miles. Now, they've gotten it down to just under 40 miles — a light year sized leap.The result is some of the clearest images to date of the fine structures that make up the Sun's formidable corona, the outermost layer of its atmosphere known for its unbelievable temperatures and violent, unpredictable outbursts.The authors are optimistic that their blur-bypassing techniques will be a game-changer."These are by far the most detailed observations of this kind, showing features not previously observed, and it's not quite clear what they are," coauthor Vasyl Yurchyshyn, a research professor at the New Jersey Institute of Technology's Center for Terrestrial Research, said in a statement about the work."It is super exciting to build an instrument that shows us the Sun like never before," echoed lead author Dirk Schmidt, an adaptive optics scientist at the US National Solar Observatory.Stretching for millions of miles into space, the corona is the staging ground for the Sun's violent outbursts, which range from solar storms, to solar flares, to coronal mass ejections. One reason scientists are interested in these phenomena is because they continue to batter our own planet's atmosphere, playing a significant role in the Earth's climate and wreaking havoc on our electronics. Then, at a reach totally beyond our very limited human purview, is the corona's mighty solar wind, which sweeps across the entire solar system, shielding it from cosmic rays.But astronomers are still trying to understand how these solar phenomena occur. One abiding mystery is why the corona can reach temperatures in the millions of degrees Fahrenheit, when the Sun's surface it sits thousands of miles above is no more than a relatively cool 10,000 degrees. The conundrum even has a name: the coronal heating problem.The level of detailed captured in the latest images, taken with an adaptive optics system installed on the Goode Solar Telescope at the CSTR, could be transformative in probing these mysteries.One type of feature the unprecedented resolution revealed were solar prominences, which are large, flashy structures that protrude from the sun's surface, found in twisty shapes like arches or loops. A spectacular video shows a solar prominence swirling like a tortured water spout as it's whipped around by the sun's magnetic field.Most awe-inspiring of all are the examples of what's known as coronal rain. Appearing like waterfalls suspended in midair, the phenomenon is caused as plasma cools and condenses into huge globs before crashing down to the sun's surface. These were imaged at a scale smaller than 100 kilometers, or about 62 miles. In solar terms, that's pinpoint accuracy."With coronal adaptive optics now in operation, this marks the beginning of a new era in solar physics, promising many more discoveries in the years and decades to come," said coauthor  Philip R. Goode at the CSTR in a statement.More on our solar system: Scientists Detect Mysterious Object in Deep Solar SystemShare This Article #new #imaging #technique #makes #sun

Comparison of a megalodon tooth and a great white shark tooth, not associated with the study.NewsletterSign up for our email newsletter for the latest science newsMegalodon teeth have always been key to understanding the ancient marine predator. Fossilized teeth are all that remain to prove the existence of these massive sharks, and the name megalodon is from the Greek for “big tooth.”A new study, published in Earth and Planetary Science Letters, highlights the importance of the megalodon’s human-hand-sized teeth once again. Thanks to extracting and analyzing the traces of zinc left in the fossilized teeth, researchers now know that the megalodon’s diet was much broader than scientists once believed.“Megalodon was by all means flexible enough to feed on marine mammals and large fish, from the top of the food pyramid as well as lower levels – depending on availability,” said Jeremy McCormack from the Department of Geosciences at Goethe University, in a press release.What Did the Megalodon Eat?Clocking in at 78 feet in length and weighing about twice as much as a semi truck, the megalodon was a big fish with a big appetite. It is suggested that a member of the Otodus shark family would require about 100,000 kilocalories per day to survive. Due to this extreme number, scientists have often assumed that the megalodon’s main source of calories came from whales.This new study suggests that whales were not the only item on the megalodon’s daily menu and that these sharks were actually quite adaptable when it came to their food. The research team analyzed 18-million-year-old giant teeth that came from two fossil deposits in Sigmaringen and Passau. What they were looking for was the presence of zinc-66 and zinc-64, two isotopes commonly ingested with food. Typically, the higher up in a food pyramid an animal is, the lower the presence of zinc. As they are oftentimes at the top of the food chain, species such as Otodus megalodon and Otodus chubutensis have a low ratio of zinc-66 to zinc-64 compared to species lower on the food chain.“Sea bream, which fed on mussels, snails, and crustaceans, formed the lowest level of the food chain we studied,” said McCormack in the press release. “Smaller shark species such as requiem sharks and ancestors of today’s cetaceans, dolphins, and whales, were next. Larger sharks, such as sand tiger sharks, were further up the food pyramid, and at the top were giant sharks like Araloselachus cuspidatus and the Otodus sharks, which include megalodon.”Surprisingly, the zinc levels in the megalodon teeth weren’t always that different from the zinc levels in species lower down the food chain. This result means that the commonly held scientific belief that megalodons focused their attention on eating large marine mammals may be incorrect. Instead, McCormack refers to the megalodon as an “ecologically versatile generalist” that adapted to environmental and regional constraints that changed the availability and variety of their prey.A New Method in Teeth TestingUsing the zinc content of fossilized teeth is a relatively new method of analysis, and the research team working on the megalodon couldn’t be happier with their results. The methods used in this study have not only been used for prehistoric shark and whale species but also modern-day shark species, and have even been used on herbivorous prehistoric rhinoceroses.Overall, these new methods have begun to rewrite the history of megalodon’s eating habits and may help to explain more about why these giants of the food chain went extinct. “gives us important insights into how the marine communities have changed over geologic time, but more importantly the fact that even ‘supercarnivores’ are not immune to extinction,” said Kenshu Shimada, a paleobiologist at DePaul University and a coauthor of this study, in the press release.Article SourcesOur writers at Discovermagazine.com use peer-reviewed studies and high-quality sources for our articles, and our editors review for scientific accuracy and editorial standards. Review the sources used below for this article:Earth and Planetary Science Letters. Miocene marine vertebrate trophic ecology reveals megatooth sharks as opportunistic supercarnivoresAs the marketing coordinator at Discover Magazine, Stephanie Edwards interacts with readers across Discover's social media channels and writes digital content. Offline, she is a contract lecturer in English & Cultural Studies at Lakehead University, teaching courses on everything from professional communication to Taylor Swift, and received her graduate degrees in the same department from McMaster University. You can find more of her science writing in Lab Manager and her short fiction in anthologies and literary magazine across the horror genre.1 free article leftWant More? Get unlimited access for as low as /monthSubscribeAlready a subscriber?Register or Log In1 free articleSubscribeWant more?Keep reading for as low as !SubscribeAlready a subscriber?Register or Log In #18millionyearold #megalodon #teeth #reveal #predator039s

A team of astronomers observed a confused exoplanet orbiting its two parent stars in a highly unusual way.As New Scientist reports, the planet, which was first discovered in 2004, is located in a system called Nu Octantis 72 light-years away, and is twice the size of Jupiter. After it was spotted, some physicists thought its mere existence was impossible due to its extremely close proximity to its twin stars.But according to a new paper published in the journal Nature, an international team of researchers is proposing a wild new theory to explain how the planet could exist while also having such an extremely tight orbit.They propose that one of the stars and the planet orbit the second star in two opposite directions. In other words, the planet is retrograde, or orbiting the star in reverse."The existence of this planet has been controversial, because there were no observational precedents and we expect planets to form in prograde orbit if they form at the same time as the stars," coauthor and University of Hong Kong professor Man Hoi Lee told IFLScience.To make matters even more unusual, the researchers propose that the planet's orbit is sandwiched between the two stars, forcing it to thread the needle during each orbit.It's an erratic dance that highlights how much there's still to learn about the complex orbital mechanics of multi-star systems."It invites scientists to consider a wider range of star and planet scenarios regarding both formation and evolution," University of Texas at Arlington professor Manfred Cuntz, who was not involved in the research, told New Scientist.One of the system's stars is a white dwarf, indicating it's nearing the end of its life cycle and making Nu Octantis an even more exotic outlier. The scientists estimate that the system was formed 2.9 billion years ago.However, the planet came to be much later. The researchers propose that it either used to orbit both stars, and changed to its unusual trajectory after one of the stars turned into a white dwarf, or it accreted its considerable mass from said white dwarf.But more research is needed before they can develop a more accurate picture of how the planet evolved."Observations of other planets in tight binary systems with late-stage or post-main- sequence stellar components will provide additional clues for us to better understand the formation and dynamical evolution of planetary systems," the team wrote in its paper.The researchers are already excited to get a closer glimpse of a similar binary star system, such as HD 59686, which also hosts an enormous gas giant with six times the mass of Jupiter.More on binary star systems: Alpha Centauri Sending Stream of Objects Into Our Solar System, Scientists ProposeShare This Article #scientists #intrigued #strange #behavior #distant

James Gentz has seen birds aplenty on his East Texas rice-and-crawfish farm: snow geese and pintails, spoonbills and teal. The whooping crane couple, though, he found “magnificent.” These endangered, long-necked behemoths arrived in 2021 and set to building a nest amid his flooded fields. “I just loved to see them,” Gentz says. Not every farmer is thrilled to host birds. Some worry about the spread of avian flu, others are concerned that the birds will eat too much of their valuable crops. But as an unstable climate delivers too little water, careening temperatures and chaotic storms, the fates of human food production and birds are ever more linked—with the same climate anomalies that harm birds hurting agriculture too. In some places, farmer cooperation is critical to the continued existence of whooping cranes and other wetland-dependent waterbird species, close to one-third of which are experiencing declines. Numbers of waterfowlhave crashed by 20 percent since 2014, and long-legged wading shorebirds like sandpipers have suffered steep population losses. Conservation-minded biologists, nonprofits, government agencies, and farmers themselves are amping up efforts to ensure that each species survives and thrives. With federal support in the crosshairs of the Trump administration, their work is more importantthan ever. Their collaborations, be they domestic or international, are highly specific, because different regions support different kinds of agriculture—grasslands, or deep or shallow wetlands, for example, favored by different kinds of birds. Key to the efforts is making it financially worthwhile for farmers to keep—or tweak—practices to meet bird forage and habitat needs. Traditional crawfish-and-rice farms in Louisiana, as well as in Gentz’s corner of Texas, mimic natural freshwater wetlands that are being lost to saltwater intrusion from sea level rise. Rice grows in fields that are flooded to keep weeds down; fields are drained for harvest by fall. They are then re-flooded to cover crawfish burrowed in the mud; these are harvested in early spring—and the cycle begins again. That second flooding coincides with fall migration—a genetic and learned behavior that determines where birds fly and when—and it lures massive numbers of egrets, herons, bitterns, and storks that dine on the crustaceans as well as on tadpoles, fish, and insects in the water. On a biodiverse crawfish-and-rice farm, “you can see 30, 40, 50 species of birds, amphibians, reptiles, everything,” says Elijah Wojohn, a shorebird conservation biologist at nonprofit Manomet Conservation Sciences in Massachusetts. In contrast, if farmers switch to less water-intensive corn and soybean production in response to climate pressures, “you’ll see raccoons, deer, crows, that’s about it.” Wojohn often relies on word-of-mouth to hook farmers on conservation; one learned to spot whimbrel, with their large, curved bills, got “fired up” about them and told all his farmer friends. Such farmer-to-farmer dialogue is how you change things among this sometimes change-averse group, Wojohn says. In the Mississippi Delta and in California, where rice is generally grown without crustaceans, conservation organizations like Ducks Unlimited have long boosted farmers’ income and staying power by helping them get paid to flood fields in winter for hunters. This attracts overwintering ducks and geese—considered an extra “crop”—that gobble leftover rice and pond plants; the birds also help to decompose rice stalks so farmers don’t have to remove them. Ducks Unlimited’s goal is simple, says director of conservation innovation Scott Manley: Keep rice farmers farming rice. This is especially important as a changing climate makes that harder. 2024 saw a huge push, with the organization conserving 1 million acres for waterfowl. Some strategies can backfire. In Central New York, where dwindling winter ice has seen waterfowl lingering past their habitual migration times, wildlife managers and land trusts are buying less productive farmland to plant with native grasses; these give migratory fuel to ducks when not much else is growing. But there’s potential for this to produce too many birds for the land available back in their breeding areas, says Andrew Dixon, director of science and conservation at the Mohamed Bin Zayed Raptor Conservation Fund in Abu Dhabi, and coauthor of an article about the genetics of bird migration in the 2024 Annual Review of Animal Biosciences. This can damage ecosystems meant to serve them. Recently, conservation efforts spanning continents and thousands of miles have sprung up. One seeks to protect buff-breasted sandpipers. As they migrate 18,000 miles to and from the High Arctic where they nest, the birds experience extreme hunger—hyperphagia—that compels them to voraciously devour insects in short grasses where the bugs proliferate. But many stops along the birds’ round-trip route are threatened. There are water shortages affecting agriculture in Texas, where the birds forage at turf grass farms; grassland loss and degradation in Paraguay; and in Colombia, conversion of forage lands to exotic grasses and rice paddies these birds cannot use. Conservationists say it’s critical to protect habitat for “buffies” all along their route, and to ensure that the winters these small shorebirds spend around Uruguay’s coastal lagoons are a food fiesta. To that end, Manomet conservation specialist Joaquín Aldabe, in partnership with Uruguay’s agriculture ministry, has so far taught 40 local ranchers how to improve their cattle grazing practices. Rotationally moving the animals from pasture to pasture means grasses stay the right length for insects to flourish. There are no easy fixes in the North American northwest, where bird conservation is in crisis. Extreme drought is causing breeding grounds, molting spots, and migration stopover sites to vanish. It is also endangering the livelihoods of farmers, who feel the push to sell land to developers. From Southern Oregon to Central California, conservation allies have provided monetary incentives for water-strapped grain farmers to leave behind harvest debris to improve survivability for the 1 billion birds that pass through every year, and for ranchers to flood-irrigate unused pastures. One treacherous leg of the northwest migration route is the parched Klamath Basin of Oregon and California. For three recent years, “we saw no migrating birds. I mean, the peak count was zero,” says John Vradenburg, supervisory biologist of the Klamath Basin National Wildlife Refuge Complex. He and myriad private, public, and Indigenous partners are working to conjure more water for the basin’s human and avian denizens, as perennial wetlands become seasonal wetlands, seasonal wetlands transition to temporary wetlands, and temporary wetlands turn to arid lands. Taking down four power dams and one levee has stretched the Klamath River’s water across the landscape, creating new streams and connecting farm fields to long-separated wetlands. But making the most of this requires expansive thinking. Wetland restoration—now endangered by loss of funding from the current administration—would help drought-afflicted farmers by keeping water tables high. But what if farmers could also receive extra money for their businesses via eco-credits, akin to carbon credits, for the work those wetlands do to filter-clean farm runoff? And what if wetlands could function as aquaculture incubators for juvenile fish, before stocking rivers? Klamath tribes are invested in restoring endangered c’waam and koptu sucker fish, and this could help them achieve that goal. As birds’ traditional resting and nesting spots become inhospitable, a more sobering question is whether improvements can happen rapidly enough. The blistering pace of climate change gives little chance for species to genetically adapt, although some are changing their behaviors. That means that the work of conservationists to find and secure adequate, supportive farmland and rangeland as the birds seek out new routes has become a sprint against time. This story originally appeared at Knowable Magazine. Lela Nargi, Knowable Magazine Knowable Magazine explores the real-world significance of scholarly work through a journalistic lens. 0 Comments #how #farmers #can #help #rescue

smelly shield Penguin poop may help preserve Antarctic climate Ammonia aerosols from penguin guano likely play a part in the formation of heat-shielding clouds. Bob Berwyn, Inside Climate News – May 24, 2025 7:07 am | 4 Credit: Getty Credit: Getty Story text Size Small Standard Large Width * Standard Wide Links Standard Orange * Subscribers only   Learn more This article originally appeared on Inside Climate News, a nonprofit, non-partisan news organization that covers climate, energy, and the environment. Sign up for their newsletter here. New research shows that penguin guano in Antarctica is an important source of ammonia aerosol particles that help drive the formation and persistence of low clouds, which cool the climate by reflecting some incoming sunlight back to space. The findings reinforce the growing awareness that Earth’s intricate web of life plays a significant role in shaping the planetary climate. Even at the small levels measured, the ammonia particles from the guano interact with sulfur-based aerosols from ocean algae to start a chemical chain reaction that forms billions of tiny particles that serve as nuclei for water vapor droplets. The low marine clouds that often cover big tracts of the Southern Ocean around Antarctica are a wild card in the climate system because scientists don’t fully understand how they will react to human-caused heating of the atmosphere and oceans. One recent study suggested that the big increase in the annual global temperature during 2023 and 2024 that has continued into this year was caused in part by a reduction of that cloud cover. “I’m constantly surprised at the depth of how one small change affects everything else,” said Matthew Boyer, a coauthor of the new study and an atmospheric scientist at the University of Helsinki’s Institute for Atmospheric and Earth System Research. “This really does show that there is a deep connection between ecosystem processes and the climate. And really, it’s the synergy between what’s coming from the oceans, from the sulfur-producing species, and then the ammonia coming from the penguins.” Climate survivors Aquatic penguins evolved from flying birds about 60 million years ago, shortly after the age of dinosaurs, and have persisted through multiple, slow, natural cycles of ice ages and warmer interglacial eras, surviving climate extremes by migrating to and from pockets of suitable habitat, called climate refugia, said Rose Foster-Dyer, a marine and polar ecologist with the University of Canterbury in New Zealand. A 2018 study that analyzed the remains of an ancient “super colony” of the birds suggests there may have been a “penguin optimum” climate window between about 4,000 and 2,000 years ago, at least for some species in some parts of Antarctica, she said. Various penguin species have adapted to different habitat niches and this will face different impacts caused by human-caused warming, she said. Foster-Dyer has recently done penguin research around the Ross Sea, and said that climate change could open more areas for land-breeding Adélie penguins, which don’t breed on ice like some other species. “There’s evidence that this whole area used to have many more colonies … which could possibly be repopulated in the future,” she said. She is also more optimistic than some scientists about the future for emperor penguins, the largest species of the group, she added. “They breed on fast ice, and there’s a lot of publications coming out about how the populations might be declining and their habitat is hugely threatened,” she said. “But they’ve lived through so many different cycles of the climate, so I think they’re more adaptable than people currently give them credit for.” In total, about 20 million breeding pairs of penguins nest in vast colonies all around the frozen continent. Some of the largest colonies, with up to 1 million breeding pairs, can cover several square miles.There aren’t any solid estimates for the total amount of guano produced by the flightless birds annually, but some studies have found that individual colonies can produce several hundred tons. Several new penguin colonies were discovered recently when their droppings were spotted in detailed satellite images. A few penguin colonies have grown recently while others appear to be shrinking, but in general, their habitat is considered threatened by warming and changing ice conditions, which affects their food supplies. The speed of human-caused warming, for which there is no precedent in paleoclimate records, may exacerbate the threat to penguins, which evolve slowly compared to many other species, Foster-Dyer said. “Everything’s changing at such a fast rate, it’s really hard to say much about anything,” she said. Recent research has shown how other types of marine life are also important to the global climate system. Nutrients from bird droppings help fertilize blooms of oxygen-producing plankton, and huge swarms of fish that live in the middle layers of the ocean cycle carbon vertically through the water, ultimately depositing it in a generally stable sediment layer on the seafloor. Tricky measurements Boyer said the new research started as a follow-up project to other studies of atmospheric chemistry in the same area, near the Argentine Marambio Base on an island along the Antarctic Peninsula. Observations by other teams suggested it could be worth specifically trying to look at ammonia, he said. Boyer and the other scientists set up specialized equipment to measure the concentration of ammonia in the air from January to March 2023. They found that, when the wind blew from the direction of a colony of about 60,000 Adélie penguins about 5 miles away, the ammonia concentration increased to as high as 13.5 parts per billion—more than 1,000 times higher than the background reading. Even after the penguins migrated from the area toward the end of February, the ammonia concentration was still more than 100 times as high as the background level. “We have one instrument that we use in the study to give us the chemistry of gases as they’re actually clustering together,” he said. “In general, ammonia in the atmosphere is not well-measured because it’s really difficult to measure, especially if you want to measure at a very high sensitivity, if you have low concentrations like in Antarctica,” he said. Penguin-scented winds The goal was to determine where the ammonia is coming from, including testing a previous hypothesis that the ocean surface could be the source, he said. But the size of the penguin colonies made them the most likely source. “It’s well known that sea birds give off ammonia. You can smell them. The birds stink,” he said. “But we didn’t know how much there was. So what we did with this study was to quantify ammonia and to quantify its impact on the cloud formation process.” The scientists had to wait until the wind blew from the penguin colony toward the research station. “If we’re lucky, the wind blows from that direction and not from the direction of the power generator,” he said. “And we were lucky enough that we had one specific event where the winds from the penguin colony persisted long enough that we were actually able to track the growth of the particles. You could be there for a year, and it might not happen.” The ammonia from the guano does not form the particles but supercharges the process that does, Boyer said. “It’s really the dimethyl sulfide from phytoplankton that gives off the sulfur,” he said. “The ammonia enhances the formation rate of particles. Without ammonia, sulfuric acid can form new particles, but with ammonia, it’s 1,000 times faster, and sometimes even more, so we’re talking up to four orders of magnitude faster because of the guano.” This is important in Antarctica specifically because there are not many other sources of particles, such as pollution or emissions from trees, he added. “So the strength of the source matters in terms of its climate effect over time,” he said. “And if the source changes, it’s going to change the climate effect.” It will take more research to determine if penguin guano has a net cooling effect on the climate. But in general, he said, if the particles transport out to sea and contribute to cloud formation, they will have a cooling effect. “What’s also interesting,” he said, “is if the clouds are over ice surfaces, it could actually lead to warming because the clouds are less reflective than the ice beneath.” In that case, the clouds could actually reduce the amount of heat that brighter ice would otherwise reflect away from the planet. The study did not try to measure that effect, but it could be an important subject for future research, he added. The guano effect lingers even after the birds leave the breeding areas. A month after they were gone, Boyer said ammonia levels in the air were still 1,000 times higher than the baseline. “The emission of ammonia is a temperature-dependent process, so it’s likely that once wintertime comes, the ammonia gets frozen in,” he said. “But even before the penguins come back, I would hypothesize that as the temperature warms, the guano starts to emit ammonia again. And the penguins move all around the coast, so it’s possible they’re just fertilizing an entire coast with ammonia.” Bob Berwyn, Inside Climate News 4 Comments #penguin #poop #help #preserve #antarctic

By Natalia Mesa Published May 23, 2025 | Comments| Giant ground sloths Megalocnus rodens and Megalonyx wheatleyi at the American Museum of Natural History © Dallas Krentzel Giant sloths with razor-sharp claws and as large as Asian bull elephants once roamed the Earth, snacking on leaves at the tops of trees with a prehensile tongue. Now, scientists have figured out why they became so huge—and why these massive sloths didn’t stick around—according to a new study published in Science. Today, two sloth species dwell in Central and South America. But long ago, dozens of sloth species populated the Americas, all the way from Argentina to Canada. Like modern-day sloths, the smaller species were tree-dwelling. But the larger sloths? “They looked like grizzly bears but five times larger,” Rachel Narducci, collection manager of vertebrate paleontology at the Florida Museum of Natural History and coauthor of the study, in a statement. The larger sloths didn’t do much tree climbing, at risk of falling to their deaths. Instead, they survived by being terrifying; the largest sloths had long, sharp claws that they used to carve their own caves out of raw earth and rocks. But exactly why they got so large remained a mystery. To figure out how these sloths got so massive, researchers analyzed ancient sloth DNA and compared more than 400 fossils from natural history museums to create a sloth tree of life. The researchers traced the sloths’ origin to 35 million years ago. And, because the scientists were particularly interested in how sloths got their size, they estimated their weights by taking fossil measurements. The researchers concluded that the Earth’s past climate was a big factor. Thirty-five million years ago, the first ancestor of modern-day sloths, which lived in what is now Argentina, was roughly the size of a large dog. Sloths hardly changed in size for 20 million years, and lived on the ground. Then, during a warming period around 16 million years ago, sloths adapted by evolving smaller physiques due to their need to keep cool. Then, as Earth cooled down again—which it’s been doing on and off for the past 50 million years—sloths started to get bigger and bigger. They also started to migrate, fanning out from Argentina throughout North and South America, and even up to Alaska and Canada. These new habitats presented challenges that the sloths met, in part, by bulking up. This new size also helped them keep warm and stay safe from predators. “This would’ve allowed them to conserve energy and water and travel more efficiently across habitats with limited resources,” Narducci said. “And if you’re in an open grassland, you need protection, and being bigger provides some of that.” They reached their most massive size during the Pleistocene Ice Ages, which spanned roughly 3 million to 12,000 years ago, shortly before they disappeared. Scientists aren’t completely sure why sloths went extinct, but they do have some guesses. Early humans migrated to the Americas around 20,000 years ago. Larger ground-dwelling sloths likely became a prime, meaty target for early humans, and being on the ground became a liability. Larger sloths were the first to go, but tree sloths didn’t escape unscathed. Over time, more and more species of tree-dwelling sloths went extinct, too. Two species survived in the Caribbean until around 4,500 years ago—until humans wiped them out. Now, sloths mostly keep to Central and South America, but thankfully aren’t on the menu anymore. Daily Newsletter #why #ancient #sloths #became #size

Photo Credit: NASA New Study Uses AI to Reveal Dry Origins of Mars’ Mysterious Slope Streaks Highlights AI maps 500,000 Martian slope streaks with no signs of water New study links streaks to wind and dust, not liquid brines Findings reshape Mars exploration and contamination concerns Advertisement The origin of Recurring Slope Linea, the long, dark markings that stretches across the slopes of Martian surface for hundreds of feet, has been a topic of debate for a long time. They appear during warmer season and they were seen as one of the most compelling signs that liquid water might still exist on Mars, suggesting a rare pocket of habitability on an otherwise arid planet. However, this view has been challenged by a new study by a group of researchers Brown University and the University of Bern. Using machine learning and leveraging satellite images, they have found evidence about the dry processes being the origin of these streaks.Machine learning breakthrough brings new evidencesAccording to Adomas Valantinas, a postdoctoral researcher at Brown who coauthored the research with Valentin Bickel, a researcher at Bern, a big focus of Mars research is understanding modern-day processes on Mars, including the possibility of liquid water on the surface. This study reviewed these features but found no evidence of water. Their model favours dry formation processes.Valantinas and Bickel integrated over 86000 high-resolution satellite images with a machine learning algorithm for analysis. They created the first global map of Martian slope streaks, cataloguing over 500,000 individual features across the planet's surface. This database enables an unprecedented statistical analysis for the origin and location of these streaks.Researchers used the complete streak map to compare the locations of these features with environmental factors like wind speed, temperature, dust accumulation, and surface hydration. They did not find any correlation between the streaks and water or frost. Rather, these features are more common in areas with high wind activity and dust deposition.Future of Mars explorationThis study provides insights in understanding the surface activities of current Martian environment. The streak sites were used to be treated with caution because of environmental contamination concerns. Ruling out the possibility of liquid water as origin of streaks, the study almost cancels out the probable risk of Earth based contamination. For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who'sThat360 on Instagram and YouTube. Further reading: Mars, Recurring Slope Lineae, RSL, NASA, Brown University, University of Bern, Machine Learning, Planetary Science, Mars Exploration, AI in Astronomy, Dust Activity, Martian Habitats Gadgets 360 Staff The resident bot. If you email me, a human will respond. More Related Stories #new #study #uses #reveal #dry

Anthropic has announced two new AI models that it claims represent a major step toward making AI agents truly useful. AI agents trained on Claude Opus 4, the company’s most powerful model to date, raise the bar for what such systems are capable of by tackling difficult tasks over extended periods of time and responding more usefully to user instructions, the company says. Claude Opus 4 has been built to execute complex tasks that involve completing thousands of steps over several hours. For example, it created a guide for the video game Pokémon Red while playing it for more than 24 hours straight. The company’s previously most powerful model, Claude 3.7 Sonnet, was capable of playing for just 45 minutes, says Dianne Penn, product lead for research at Anthropic. Similarly, the company says that one of its customers, the Japanese technology company Rakuten, recently deployed Claude Opus 4 to code autonomously for close to seven hours on a complicated open-source project.  Anthropic achieved these advances by improving the model’s ability to create and maintain “memory files” to store key information. This enhanced ability to “remember” makes the model better at completing longer tasks. “We see this model generation leap as going from an assistant to a true agent,” says Penn. “While you still have to give a lot of real-time feedback and make all of the key decisions for AI assistants, an agent can make those key decisions itself. It allows humans to act more like a delegator or a judge, rather than having to hold these systems’ hands through every step.” While Claude Opus 4 will be limited to paying Anthropic customers, a second model, Claude Sonnet 4, will be available for both paid and free tiers of users. Opus 4 is being marketed as a powerful, large model for complex challenges, while Sonnet 4 is described as a smart, efficient model for everyday use.   Both of the new models are hybrid, meaning they can offer a swift reply or a deeper, more reasoned response depending on the nature of a request. While they calculate a response, both models can search the web or use other tools to improve their output. AI companies are currently locked in a race to create truly useful AI agents that are able to plan, reason, and execute complex tasks both reliably and free from human supervision, says Stefano Albrecht, director of AI at the startup DeepFlow and coauthor of Multi-Agent Reinforcement Learning: Foundations and Modern Approaches. Often this involves autonomously using the internet or other tools. There are still safety and security obstacles to overcome. AI agents powered by large language models can act erratically and perform unintended actions—which becomes even more of a problem when they’re trusted to act without human supervision. “The more agents are able to go ahead and do something over extended periods of time, the more helpful they will be, if I have to intervene less and less,” he says. “The new models’ ability to use tools in parallel is interesting—that could save some time along the way, so that’s going to be useful.”As an example of the sorts of safety issues AI companies are still tackling, agents can end up taking unexpected shortcuts or exploiting loopholes to reach the goals they’ve been given. For example, they might book every seat on a plane to ensure that their user gets a seat, or resort to creative cheating to win a chess game. Anthropic says it managed to reduce this behavior, known as reward hacking, in both new models by 65% relative to Claude Sonnet 3.7. It achieved this by more closely monitoring problematic behaviors during training, and improving both the AI’s training environment and the evaluation methods. #anthropics #new #hybrid #model #can

May 21, 202522 min readMildred Weeks Wells’s Work on Airborne Transmission Could Have Saved Many Lives—If the Scientific Establishment ListenedMildred Weeks Wells and her husband figured out that disease-causing pathogens can spread through the air like smoke Dutton; Lily WhearAir-Borne: The Hidden History of the Life We Breathe, by Carl Zimmer, charts the history of the field of aerobiology: the science of airborne microorganisms. In this episode, we discover the story of two lost pioneers of the 1930s: physician and self-taught epidemiologist Mildred Weeks Wells and her husband, sanitary engineer William Firth Wells. Together, they proved that infectious pathogens could spread through the air over long distances. But the two had a reputation as outsiders, and they failed to convince the scientific establishment, who ignored their findings for decades. What the pair figured out could have saved many lives from tuberculosis, SARS, COVID and other airborne diseases. The contributions of Mildred Weeks Wells and her husband were all but erased from history—until now.LISTEN TO THE PODCASTOn supporting science journalismIf you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.TRANSCRIPTCarl Zimmer: Mildred is hired in the late 1920s to put together everything that was known about polio. And she does this incredible study, where she basically looks for everything that she can find about how polio spreads.At the time, the idea that it could spread through the air was really looked at as being just an obsolete superstition. Public health experts would say, look, a patient's breath is basically harmless. But the epidemiology looks to her like these germs are airborne, and this goes totally against the consensus at the time.Carol Sutton Lewis: Hello, I'm Carol Sutton Lewis. Welcome to the latest episode of Lost Women of Science Conversations, where we talk with authors and artists who've discovered and celebrated female scientists in books, poetry, film, and the visual arts.Today I'm joined by Carl Zimmer, an award-winning New York Times columnist and the author of 15 books about science. His latest book, Airborne: The Hidden History of the Life We Breathe, focuses on the last great biological frontier: the air. It presents the history of aerobiology, which is the science dealing with the occurrence, transportation, and effects of airborne microorganisms.The book chronicles the exploits of committed aerobiologists from the early pioneers through to the present day. Among these pioneers were Mildred Weeks Wells and her husband, William Firth Wells.Airborne tells the story of how Mildred and William tried to sound the alarm about airborne infections, but for many reasons, their warnings went unheard.Welcome, Carl Zimmer. It's such a pleasure to have you with us to tell us all about this fascinating woman and her contributions to science.Can you please tell us about Mildred Weeks Wells—where and how she grew up and what led her to the field of aerobiology?Carl Zimmer: She was born in 1891, and she came from a very prominent Texas family—the Denton family. Her great-grandfather is actually whom the city of Denton, Texas is named after. Her grandfather was a surgeon for the Confederate Army in the Civil War, and he becomes the director of what was called then the State Lunatic Asylum.And he and the bookkeeper there, William Weeks, are both charged with embezzlement. It's a big scandal. The bookkeeper then marries Mildred's mother. Then, shortly after Mildred's born, her father disappears. Her mother basically abandons her with her grandmother. And she grows up with her sister and grandmother in Austin, Texas. A comfortable life, but obviously there's a lot of scandal hanging over them.She is clearly incredibly strong-willed. She goes to medical school at the University of Texas and graduates in 1915, one of three women in a class of 34. That is really something for a woman at that point—there were hardly any women with medical degrees in the United States, let alone someone in Texas.But she books out of there. She does not stick around. She heads in 1915 to Washington, D.C., and works at the Public Health Service in a lab called the Hygienic Laboratory. Basically, what they're doing is studying bacteria. You have to remember, this is the golden age of the germ theory of disease. People have been figuring out that particular bacteria or viruses cause particular diseases, and that knowledge is helping them fight those diseases.It's there in Washington at this time that she meets a man who will become her husband, William Firth Wells.Carol Sutton Lewis: Just a quick aside—because we at Lost Women of Science are always interested in how you discover the material in addition to what you've discovered. How were you able to piece together her story? What sources were you able to find? It seems like there wasn't a lot of information available.Carl Zimmer: Yeah, it was a tough process. There is little information that's really easy to get your hands on. I mean, there is no biography of Mildred Wells or her husband, William Firth Wells.At the Rockefeller archives, they had maybe 30 document boxes full of stuff that was just miraculously conserved there. There are also letters that she wrote to people that have been saved in various collections.But especially with her early years, it's really tough. You know, in all my work trying to dig down for every single scrap of information I could find of her, I have only found one photograph of her—and it's the photograph in her yearbook. That’s it.Carol Sutton Lewis: You talked about that photograph in the book, and I was struck by your description of it. You say that she's smiling, but the longer you look at her smile, the sadder it becomes. What do you think at that young age was the source of the sadness?Carl Zimmer: I think that Mildred grew up with a lot of trauma. She was not the sort of person to keep long journals or write long letters about these sorts of things. But when you've come across those clues in these brief little newspaper accounts, you can kind of read between the lines.There are reports in newspapers saying that Mildred's mother had come to Austin to pay a visit to Mildred because she had scarlet fever when she was 10, and then she goes away again. And when I look at her face in her yearbook, it doesn't surprise me that there is this cast of melancholy to it because you just think about what she had gone through just as a kid.Carol Sutton Lewis: Oh. Absolutely. And fast forward, she meets William and they marry. They have a son, and they start collaborating. How did that begin?Carl Zimmer: The collaboration takes a while. So William Wells is also working at the Public Health Service at the time. He is a few years older than Mildred and he has been trained at MIT as what was called then a sanitarian. In other words, he was going to take the germ theory of disease and was going to save people's lives.He was very clever. He could invent tests that a sanitarian could use, dip a little tube into a river and see whether the water was safe or not, things like that. He was particularly focused on keeping water clean of bacteria that could cause diseases like typhoid or cholera and he also, gets assigned by the government to study oysters because oysters, they sit in this water and they're filtering all day long. And you know, if there's bacteria in there, they're going to filter it and trap it in their tissues. And oysters are incredibly popular in the early nineteen hundreds and a shocking number of people are keeling over dying of typhoid because they're eating them raw. So William is very busy, figuring out ways to save the oyster industry. How do we purify oysters and things like that? They meet, they get married in 1917.In 1918 they have a child, William Jr. nicknamed Bud. But William is not around for the birth, because he is drafted into the army, and he goes off to serve. in World War I.Carol Sutton Lewis: So Mildred is at home with Bud and William's off at the war. But ultimately, Mildred returns to science. A few years later, where she is hired as a polio detective. Can you tell me a little bit about what the state of polio knowledge was at the time and what precisely a polio detective did?Carl Zimmer: It doesn't seem like polio really was a thing in the United States until the late 1800s. And then suddenly there's this mysterious disease that can strike children with no warning. These kids can't. walk, or suddenly these kids are dying. Not only are the symptoms completely terrifying to parents, but how it spreads is a complete mystery. And so Mildred, seems to have been hired at some point in the late 1920s To basically put together everything that was known about polio to help doctors to deal with their patients and to, you know, encourage future science to try to figure out what is this disease.You know, Mildred wasn't trained in epidemiology. So it's kind of remarkable that she taught herself. And she would turn out to be a really great epidemiologist. But, in any case, She gets hired by the International Committee for the Study of Infantile Paralysis, that was the name then for polio. And she does this incredible study, where she basically looks for everything that she can find about how polio spreads. Case studies where, in a town, like this child got polio, then this child did, and did they have contact and what sort of contact, what season was it? What was the weather like? All these different factors.And one thing that's really important to bear in mind is that, at this time, the prevailing view was that diseases spread by water, by food, by sex, by close contact. Maybe like someone just coughs and sprays droplets on you, but otherwise it's these other routes.The idea that it could spread through the air was really looked at as being just obsolete superstition. for thousands of years, people talked about miasmas, somehow the air mysteriously became corrupted and that made people sick with different diseases. That was all thrown out in the late 1800s, early 1900s when germ theory really takes hold. And so public health experts would say, look, a patient's breath is basically harmless.Carol Sutton Lewis: But Mildred doesn't agree, does she?Carl Zimmer: Well, Mildred Wells is looking at all of this, data and she is starting to get an idea that maybe these public health experts have been too quick to dismiss the air. So when people are talking about droplet infections in the 1920s, they're basically just talking about, big droplets that someone might just sneeze in your face. But the epidemiology looks to her like these germs are airborne, are spreading long distances through the air.So Mildred is starting to make a distinction in her mind about what she calls airborne and droplet infections. So, and this is really the time that the Wellses collectively are thinking about airborne infection and it's Mildred is doing it. And William actually gives her credit for this later on.Carol Sutton Lewis: Right. and her results are published in a book about polio written entirely by female authors, which is quite unusual for the time.Carl Zimmer: Mm hmm. Right. The book is published in 1932, and the reception just tells you so much about what it was like to be a woman in science. The New England Journal of Medicine reviews the book, which is great. But, here's a line that they give, they say, it is interesting to note that this book is entirely the product of women in medicine and is the first book.So far as a reviewer knows. by a number of authors, all of whom are of the female sex. So it's this: Oh, look at this oddity. And basically, the virtue of that is that women are really thorough, I, guess. so it's a very detailed book. And the reviewer writes, no one is better fitted than a woman to collect data such as this book contains. So there's no okay, this is very useful.Carol Sutton Lewis: PatronizeCarl Zimmer: Yeah. Thank you very much. Reviewers were just skating over the conclusions that they were drawing, I guess because they were women. Yeah, pretty incredible.Carol Sutton Lewis: So she is the first to submit scientific proof about this potential for airborne transmission. And that was pretty much dismissed. It wasn't even actively dismissed.It was just, nah, these women, nothing's coming outta that, except William did pay attention. I believe he too had been thinking about airborne transmission for some time and then started seriously looking at Mildred's conclusion when he started teaching at Harvard.Carl Zimmer: Yeah. So, William gets a job as a low level instructor at Harvard. He's getting paid very little. Mildred has no income. He's teaching about hygiene and sanitation, but apparently he's a terrible teacher. But he is a clever, brilliant engineer and scientist; he very quickly develops an idea that probably originated in the work that Mildred had been doing on polio. that maybe diseases actually can spread long distances through the air. So there are large droplets that we might sneeze out and cough out and, and they go a short distance before gravity pulls them down. But physics dictates that below a certain size, droplets can resist gravity.This is something that's going totally against what all the, the really prominent public health figures are saying. William Wells doesn't care. He goes ahead and he starts to, invent a way to sample air for germs. Basically it's a centrifuge. You plug it in, the fan spins, it sucks in air, the air comes up inside a glass cylinder and then as it's spinning, if there are any droplets of particles or anything floating in the air, they get flung out to the sideS.And so afterwards you just pull out the glass which is coated with, food for microbes to grow on and you put it in a nice warm place. And If there's anything in the air, you'll be able to grow a colony and see it.Carol Sutton Lewis: Amazing.Carl Zimmer: It is amazing. This, this was a crucial inventionCarol Sutton Lewis: So we have William, who is with Mildred's help moving more towards the possibility of airborne infection, understanding that this is very much not where science is at the moment, and he conducts a really interesting experiment in one of his classrooms to try to move the theory forward. We'll talk more about that experiment when we come back after the break.MidrollCarol Sutton Lewis: Welcome back to Lost Women of Science Conversations. We left off as the Wellses were about to conduct an experiment to test their theories about airborne infections. Carl, can you tell us about that experiment?Carl Zimmer: Okay. it's 1934, It's a cold day. Students come in for a lecture from this terrible teacher, William Wells. The windows are closed. The doors are closed. It's a poorly ventilated room. About 20 minutes before the end of the class, he takes this weird device that's next to him, he plugs it into the wall, and then he just goes back and keeps lecturing.It's not clear whether he even told them what he was doing. But, he then takes this little pinch of sneezing powder. out of a jar and holds it in the sort of outflow from the fan inside the air centrifuge. So all of a sudden, poof, the sneezing powder just goes off into the air. You know, there are probably about a couple dozen students scattered around this lecture hall and after a while they start to sneeze. And in fact, people All the way in theback are sneezing too.So now Wells turns off his machine, puts in a new cylinder, turns it on, keeps talking. The thing is that they are actually sneezing out droplets into the air.And some of those droplets contain harmless bacteria from their mouths. And he harvests them from the air. He actually collects them in his centrifuge. And after a few days, he's got colonies of these bacteria, but only after he had released the sneezing powder, the one before that didn't have any.So, you have this demonstration that William Wells could catch germs in the air that had been released from his students at quite a distance away, And other people can inhale them, and not even realize what's happening. In other words, germs were spreading like smoke. And so this becomes an explanation for what Mildred had been seeing in her epidemiology..Carol Sutton Lewis: Wow. That was pretty revolutionary. But how was it received?Carl Zimmer: Well, you know, At first it was received, With great fanfare, and he starts publishing papers in nineteen thirty he and Mildred are coauthors on these. And, Mildred is actually appointed as a research associate at Harvard, in nineteen thirty it's a nice title, but she doesn't get paid anything. And then William makes another discovery, which is also very important.He's thinking okay, if these things are floating in the air, is there a way that I can disinfect the air? And he tries all sorts of things and he discovers ultraviolet light works really well. In fact, you can just put an ultraviolet light in a room and the droplets will circulate around and as they pass through the ultraviolet rays, it kills the bacteria or viruses inside of them. So in 1936, when he's publishing these results, there are so many headlines in newspapers and magazines and stuff about this discovery.There's one headline that says, scientists fight flu germs with violet ray. And, there are these predictions that, we are going to be safe from these terrible diseases. Like for example, influenza, which had just, devastated the world not long beforehand, because you're going to put ultraviolet lights in trains and schools and trolleys and movie theaters.Carol Sutton Lewis: Did Mildred get any public recognition for her contributions to all of this?Carl Zimmer: Well not surprisingly, William gets the lion's share of the attention. I mean, there's a passing reference to Mildred in one article. The Associated Press says chief among his aides, Wells said, was his wife, Dr. Mildred Wells. So, William was perfectly comfortable, acknowledging her, but the reporters. Didn't care,Carol Sutton Lewis: And there were no pictures of herCarl Zimmer: Right. Mildred wasn't the engineer in that couple, but she was doing all the research on epidemiology. And you can tell from comments that people made about, and Mildred Wells is that. William would be nowhere as a scientist without Mildred. She was the one who kept him from jumping ahead to wild conclusions from the data he had so far. So they were, they're very much a team. She was doing the writing and they were collaborating, they were arguing with each other all the time about it And she was a much better writer than he was., but that wasn't suitable for a picture, so she was invisible.Carol Sutton Lewis: In the book, you write a lot about their difficult personalities and how that impacted their reputations within the wider scientific community. Can you say more about that?Carl Zimmer: Right. They really had a reputation as being really hard to deal with. People would politely call them peculiar. And when they weren't being quite so polite, they would talk about all these arguments that they would get in, shouting matches and so on. They really felt that they had discovered something incredibly important, but they were outsiders, you know, they didn't have PhDs, they didn't have really much formal training. And here they were saying that, you know, the consensus about infectious disease is profoundly wrong.Now, ironically, what happened is that once William Wells showed that ultraviolet light could kill germs, his superior at Harvard abruptly took an intense interest in all of this and said, Okay, you're going to share a patent on this with me. My name's going to be on the patent and all the research from now on is going to happen in my lab. I'm going to have complete control over what happens next. And Mildred took the lead saying no way we want total autonomy, get out of our face. She was much more aggressive in university politics, and sort of protecting their turf. And unfortunately they didn't have many allies at Harvard and pretty soon they were out, they were fired. And William Wells and his boss, Gordon Fair, were both named on a patent that was filed for using ultraviolet lamps to disinfect the air.Carol Sutton Lewis: So what happened when they left Harvard?Carl Zimmer: Well, it's really interesting watching them scrambling to find work, because their reputation had preceded them. They were hoping they could go back to Washington DC to the public health service. But, the story about the Wells was that Mildred, was carrying out a lot of the research, and so they thought, we can't hire William if it's his wife, who's quietly doing a lot of the work, like they, for some reason they didn't think, oh, we could hire them both.Carol Sutton Lewis: Or just her.Carl Zimmer: None of that, they were like, do we hire William Wells? His wife apparently hauls a lot of the weight. So no, we won't hire them. It's literally like written down. It’s, I'm not making it up. And fortunately they had a few defenders, a few champions down in Philadelphia.There was a doctor in Philadelphia who was using ultraviolet light to protect children in hospitals. And he was, really, inspired by the Wellses and he knew they were trouble. He wrote yes, I get it. They're difficult, but let's try to get them here.And so they brought them down to Philadelphia and Mildred. And William, opened up the laboratories for airborne infection at the University of Pennsylvania. And now actually Mildred got paid, for the first time, for this work. So they're both getting paid, things are starting to look betterCarol Sutton Lewis: So they start to do amazing work at the University of Pennsylvania.Carl Zimmer: That's right. That's right. William, takes the next step in proving their theory. He figures out how to actually give animals diseases through the air. He builds a machine that gets to be known as the infection machine. a big bell jar, and you can put mice in there, or a rabbit in there, and there's a tube connected to it.And through that tube, William can create a very fine mist that might have influenza viruses in it, or the bacteria that cause tuberculosis. And the animals just sit there and breathe, and lo and behold, They get tuberculosis, they get influenza, they get all these diseases,Now, meanwhile, Mildred is actually spending a lot of her time at a school nearby the Germantown Friends School, where they have installed ultraviolet lamps in some of the classrooms. And they're convinced that they can protect kids from airborne diseases. The biggest demonstration of what these lamps can do comes in 1940, because there's a huge epidemic of measles. In 1940, there's, no vaccine for measles. Every kid basically gets it.And lo and behold, the kids in the classrooms with the ultraviolet lamps are 10 times less likely to get measles than the kids just down the hall in the regular classrooms. And so this is one of the best experiments ever done on the nature of airborne infection and how you can protect people by disinfecting the air.Carol Sutton Lewis: Were they then finally accepted into the scientific community?Carl Zimmer: I know you keep waiting for that, that victory lap, but no. It's just like time and again, that glory gets snatched away from them. Again, this was not anything that was done in secret. Newspapers around Philadelphia were. Celebrating this wow, look at this, look at how we can protect our children from disease. This is fantastic. But other experts, public health authorities just were not budging. they had all taken in this dogma that the air can't be dangerous.And so again and again, they were hitting a brick wall. This is right on the eve of World War II.And so all sorts of scientists in World War II are asking themselves, what can we do? Mildred and William put themselves forward and say we don't want soldiers to get sick with the flu the way they did in World War I. They're both haunted by this and they're thinking, so we could put our ultraviolet lamps in the barracks, we could protect them. Soldiers from the flu, if the flu is airborne, like we think, not only that, but this could help to really convince all those skepticsCarol Sutton Lewis: mm.Carl Zimmer: But they failed. The army put all their money into other experiments, they were blackballed, they were shut out, and again, I think it was just because they were continuing to be just incredibly difficult. Even patrons and their friends would just sigh to each other, like, Oh my God, I've just had to deal with these, with them arguing with us and yelling at us. And by the end of World War II, things are bad, they have some sort of split up, they never get divorced, but it's just too much. Mildred, like she is not only trying to do this pioneering work in these schools, trying to keep William's labs organized, there's the matter of their son. Now looking at some documents, I would hazard a guess that he had schizophrenia because he was examined by a doctor who came to that conclusion.And so, she's under incredible pressure and eventually she cracks and in 1944 she resigns from the lab. She stops working in the schools, she stops collaborating with her husband, but she keeps doing her own science. And that's really amazing to me. What kinds of things did she do after this breakup? What kind of work did she conduct? And how was that received?Mildred goes on on her own to carry out a gigantic experiment, in hindsight, a really visionary piece of work. It's based on her experience in Philadelphia. Because she could see that the ultraviolet lamps worked very well at protecting children during a really intense measles epidemic. And so she thought to herself, if you want to really make ultraviolet light, and the theory of airborne infection live up to its true potential to protect people. You need to protect the air in a lot more places.So she gets introduced to the health commissioner in Westchester County, this is a county just north of New York City. And she pitches him this idea. She says, I want to go into one of your towns and I want to put ultraviolet lights everywhere. And this guy, William Holla, he is a very bold, flamboyant guy. He's the right guy to ask. He's like, yeah, let's do this. And he leaves it up to her to design the experiment.And so this town Pleasantville in New York gets fitted out with ultraviolet lamps in the train station, in the fountain shops, in the movie theater, in churches, all over the place. And she publishes a paper with Holla in 1950 on the results.The results are mixed though. You look carefully at them, you can see that actually, yeah, the lamps worked in certain respects. So certain diseases, the rates were lower in certain places, but sadly, this incredibly ambitious study really didn't move the needle. And yeah, it was a big disappointment and that was the last science that Mildred did.Carol Sutton Lewis: Even when they were working together, Mildred and William never really succeeded in convincing the scientific community to take airborne infection seriously, although their work obviously did move the science forward. So what did sway scientific opinion and when?Carl Zimmer: Yeah, Mildred dies in 1957. William dies in 1963. After the Wellses are dead, their work is dismissed and they themselves are quite forgotten. It really isn't until the early 2000s that a few people rediscover them.The SARS epidemic kicks up in 2003, for example, and I talked to a scientist in Hong Kong named Yuguo Li, and he was trying to understand how was this new disease spreading around? He's looking around and he finds references to papers by William Wells and Mildred Wells. He has no idea who they are and he sees that William Wells had published a book in 1955 and he's like, well, okay, maybe I need to go read the book.Nobody has the book. And the only place that he could find it was in one university in the United States. They photocopied it and shipped it to him in Hong Kong and he finally starts reading it. And it's really hard to read because again William was a terrible writer, unlike Mildred. But after a while it clicks and he's like, oh. That's it. I got it. But again, all the guidelines for controlling pandemics and diseases do not really give much serious attention to airborne infection except for just a couple diseases. And it's not until the COVID pandemic that things finally change.Carol Sutton Lewis: Wow. If we had listened to Mildred and William earlier, what might have been different?Carl Zimmer: Yeah, I do try to imagine a world in which Mildred and William had been taken seriously by more people. If airborne infection was just a seriously recognized thing at the start of the COVID pandemic, we would have been controlling the disease differently from the start. We wouldn't have been wiping down our shopping bags obsessively. People would have been encouraged to open the windows, people would have been encouraged to get air purifiers, ultraviolet lamps might have been installed in places with poor ventilation, masks might not have been so controversial.And instead these intellectual grandchildren of William and Mildred Wells had to reinvent the wheel. They had to do new studies to persuade people finally that a disease could be airborne. And it took a long time. It took months to finally move the needle.Carol Sutton Lewis: Carl, what do you hope people will take away from Mildred's story, which you have so wonderfully detailed in your book, rendering her no longer a lost woman of science? And what do you hope people will take away from the book more broadly?Carl Zimmer: I think sometimes that we imagine that science just marches on smoothly and effortlessly. But science is a human endeavor in all the good ways and in all the not-so-good ways. Science does have a fair amount of tragedy throughout it, as any human endeavor does. I'm sad about what happened to the Wells by the end of their lives, both of them. But in some ways, things are better now.When I'm writing about aerobiology in the early, mid, even late—except for Mildred, it's pretty much all men. But who were the people during the COVID pandemic who led the fight to get recognized as airborne? People like Linsey Marr at Virginia Tech, Kim Prather at University of California, San Diego, Lidia Morawska, an Australian researcher. Now, all women in science still have to contend with all sorts of sexism and sort of baked-in inequalities. But it is striking to me that when you get to the end of the book, the women show up.Carol Sutton Lewis: Well,Carl Zimmer: And they show up in force.Carol Sutton Lewis: And on that very positive note to end on, Carl, thank you so much, first and foremost, for writing this really fascinating book and within it, highlighting a now no longer lost woman of science, Mildred Weeks Wells. Your book is Airborne: The Hidden History of the Life We Breathe, and it's been a pleasure to speak with—Carl Zimmer: Thanks a lot. I really enjoyed talking about Mildred.Carol Sutton Lewis: This has been Lost Women of Science Conversations. Carl Zimmer's book Airborne: The Hidden History of the Life We Breathe is out now. This episode was hosted by me, Carol Sutton Lewis. Our producer was Luca Evans, and Hansdale Hsu was our sound engineer. Special thanks to our senior managing producer, Deborah Unger, our program manager, Eowyn Burtner, and our co-executive producers, Katie Hafner and Amy Scharf.Thanks also to Jeff DelViscio and our publishing partner, Scientific American. The episode art was created by Lily Whear and Lizzie Younan composes our music. Lost Women of Science is funded in part by the Alfred P. Sloan Foundation and the Anne Wojcicki Foundation. We're distributed by PRX.If you've enjoyed this conversation, go to our website lostwomenofscience.org and subscribe so you'll never miss an episode—that's lostwomenofscience.org. And please share it and give us a rating wherever you listen to podcasts. Oh, and please don't forget to click on the donate button—that helps us bring you even more stories of important female scientists.I'm Carol Sutton Lewis. See you next time.HostCarol Sutton LewisProducerLuca EvansGuest Carl ZimmerCarl Zimmer writes the Origins column for the New York Times and has frequently contributed to The Atlantic, National Geographic, Time, and Scientific American. His journalism has earned numerous awards, including ones from the American Association for the Advancement of Science and the National Academies of Sciences, Medicine, and Engineering. He is the author of fourteen books about science, including Life's Edge.Further Reading:Air-Borne: The Hidden History of the Life We Breathe. Carl Zimmer. Dutton, 2025Poliomyelitis. International Committee for the Study of Infantile Paralysis. Williams & Wilkins Company, 1932 “Air-borne Infection,” by William Firth Wells and Mildred Weeks Wells, in JAMA, Vol. 107, No. 21; November 21, 1936“Air-borne Infection: Sanitary Control,” by William Firth Wells and Mildred Weeks Wells, in JAMA, Vol. 107, No. 22; November 28, 1936“Ventilation in the Spread of Chickenpox and Measles within School Rooms,” by Mildred Weeks Wells, in JAMA, Vol. 129, No. 3; September 15, 1945“The 60-Year-Old Scientific Screwup That Helped Covid Kill,” by Megan Molteni, in Wired. Published online May 13, 2021WATCH THIS NEXTScience journalist Carl Zimmer joins host Rachel Feltman to look back at the history of the field, from ancient Greek “miasmas” to Louis Pasteur’s unorthodox experiments to biological warfare. #public #health #researcher #her #engineer