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    Harmful heat doesn’t always come in waves

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    In recent weeks, extreme heat waves have broiled the United States, China and Europe. But scientists are warning of another hazardous form of heat: chronic heat. In places like Miami and Phoenix, temperatures can soar for months at a time without reaching heat wave levels, potentially contributing to health issues such as kidney disfunction, sleep apnea and depression. But too little research has focused on how these impacts may compound over months of exposure, University of Miami climate and health researcher Mayra Cruz and colleagues report in the June Environmental Research Climate.

    “It’s the family that lives with conditions that are just a little bit too hot all the time and no air conditioning,” says Victoria Turner, an urban planner at UCLA who was not involved in the study. “The mother is pregnant in hot conditions, their children go to bed without air conditioning and go to schools without air conditioning, and then that’s changing their developmental physiology.” More

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      U.S. seal populations have rebounded — and so have their conflicts with humans

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      Aaron Tremper is the editorial assistant for Science News Explores. He has a B.A. in English (with minors in creative writing and film production) from SUNY New Paltz and an M.A. in Journalism from the Craig Newmark Graduate School of Journalism’s Science and Health Reporting program. A former intern at Audubon magazine and Atlanta’s NPR station, WABE 90.1 FM, he has reported a wide range of science stories for radio, print, and digital media. His favorite reporting adventure? Tagging along with researchers studying bottlenose dolphins off of New York City and Long Island, NY. More

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      Is nuclear energy good? A new book explores this complex question

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      Atomic DreamsRebecca Tuhus-DubrowAlgonquin Books, $30

      Toxic sludge. A glowing radioactive rat. A three-eyed fish named “Blinky.” These are scenes from a 1990 episode of the long-running television show The Simpsons, in which protagonist and oaf Homer is a safety inspector at the fictional Springfield Nuclear Power Plant. The imagined horrors of the plant reflect concerns many real people have had about nuclear energy over the course of its young history, which began with the first sustained nuclear reaction in 1942. That includes the Simpson-esque concern of a corporate plant owner who prioritizes profit over safety. More

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      This paint ‘sweats’ to keep your house cool

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      A cool house without air conditioning may soon be possible.

      Scientists in Singapore have developed a new type of paint that reflects sunlight and cools surfaces by slowly evaporating water. Unlike other commercially available cooling paints, which are designed to repel water to protect the underlying material, the new one even works in hot, humid places, offering a low-energy way to stay cool, researchers report June 5 in Science.

      “The key is passive cooling,” which requires no energy input, says material scientist Li Hong In other words, it works without using electricity or mechanical systems. Right now, radiative cooling is the most common type of passive cooling used in materials, including certain paints. It works by reflecting sunlight and radiating heat from a surface such as walls or roofs, into the sky. But in humid places like Singapore, water vapor in the air traps heat near the surface, which prevents it from escaping into the atmosphere and keeps the surfaces warm.In response, Hong and two other material scientists from Nanyang Technological University developed a cement-based paint that combines three cooling strategies: radiative cooling, evaporative cooling, which our skin uses, and solar reflection. In the study, the scientists painted three small houses: one with regular white paint, one with commercial cooling paint that uses only radiative cooling and one with their new formula. After two years of sun and rain in Singapore, the first two paints had turned yellow. But “our paint was still white,” says coauthor Jipeng Fei. Unlike other colors, white helps materials maintain their high reflectivity and cooling performance. More

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      Climate change is coming for your cheese

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      By affecting cows’ diets, climate change can affect cheese’s nutritional value and sensory traits such as taste, color and texture. This is true at least for Cantal — a firm, unpasteurized cheese from the Auvergne region in central France, researchers report February 20 in the Journal of Dairy Science.

      Cows in this region typically graze on local grass. But as climate change causes more severe droughts, some dairy producers are shifting to other feedstocks for their cows, such as corn, to adapt. “Farmers are looking for feed with better yields than grass or that are more resilient to droughts,” but they also want to know how dietary changes affect their products, says animal scientist Matthieu Bouchon.

      For almost five months in 2021, Bouchon and colleagues at France’s National Research Institute for Agriculture, Food and Environment tested 40 dairy cows from two different breeds — simulating a drought and supplementing grass with other fodder, largely corn, in varying amounts.

      The research team tested climate-adapted diets on cows, like the one seen here, at France’s National Research Institute for Agriculture, Food and Environment.INRAE/Matthieu Bouchon

      The team sampled milk from all cows at regular intervals. Milk’s fatty acid and protein profiles impact cheese formation, melting qualities and nutrition, so the researchers chemically identified distributions of those molecules with a technique called gas chromatography. They also identified beneficial microbes in the milk by making Petri dish cultures.

      They found that a corn-based diet did not affect milk yield and even led to an estimated reduction in the greenhouse gas methane coming from cows’ belching. But grass-fed cows’ cheese was richer and more savory than that from cows mostly or exclusively fed corn. Grass-based diets also yielded cheese with more heart-healthy omega-3 fatty acids and higher counts of probiotic lactic acid bacteria. The authors suggest that to maintain cheese quality, producers should include fresh vegetation in cows’ fodder when it is based on corn. More

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      Trees ‘remember’ times of water abundance and scarcity

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      How trees fare under drought depends heavily on their past experiences.

      In some cases, adversity breeds resilience: Spruce trees that experience long-term droughts are more resistant to future droughts, owing to an impressive ability to adjust their canopies to save water, researchers in Germany report May 16 in Plant Biology.

      On the other hand, trees may suffer when they’ve known only wet conditions and are blindsided by droughts. Pines in Switzerland, for example, have needles that appear to acclimatize to wet periods in ways that make them more vulnerable to drought, another group of scientists reported last year. More

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      A new AI-based weather tool surpasses current forecasts

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      Weather forecasting is getting cheaper and more accurate. An AI model named Aurora used machine learning to outperform current weather prediction systems, researchers report May 21 in Nature.

      Aurora could accurately predict tropical cyclone paths, air pollution and ocean waves, as well as global weather at the scale of towns or cities — offering up forecasts in a matter of seconds.

      The fact that Aurora can make such high-resolution predictions using machine learning impressed Peter Dueben, who heads the Earth system modeling group at the European Centre for Medium-Range Weather Forecasts in Bonn, Germany. “I think they have been the first to push that limit,” he says. More

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      Seafloor amber may hold hints of a tsunami 115 million years ago

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      Wavelike patterns in 115-million-year-old amber suggest that a long-ago tsunami inundated what is now northern Japan, researchers report May 15 in Scientific Reports.

      Tsunamis can be destructive and, to anything alive nearby, often terrifying. But the physical damage wrought by these giant waves eventually erodes away, typically leaving behind little evidence of their passage. As a result, there’s scant records of tsunamis stretching back beyond the current geologic epoch, which began roughly 12,000 years ago. More

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      This tool-wielding assassin turns its prey’s defenses into a trap

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      Add a little-known species of assassin bugs to the list of animals that can fashion and wield tools. And true to their name, the insects use that tool to draw their prey into an ambush, researchers report May 12 in Proceedings of the National Academy of Sciences.

      Found in Thailand and China, Pahabengkakia piliceps is a species of predatory insects called assassin bugs that has a taste for the region’s stingless bees. When researchers at Xishuangbanna Tropical Botanical Garden in China began studying the assassin bugs in 2021, they became intrigued by how P. piliceps hunt. While lying in wait at a hive’s entrance, the assassin bugs use their front legs to proficiently pick off bees that fly by. More