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The cassowary, a large flightless bird native to Australia, New Guinea, and nearby islands, has a reputation for aggression and wickedly clawed feet that can cause serious injury. Indeed, they’ve been known to attack humans dozens of times, and even occasionally kill people. But they also have a beauty trick: Their glossy black body feathers have a structure for producing shine that’s never before been seen in birds. Where other black birds like crows are shiny because of structures in their feather barbules, the cassowary instead derives its shine from a smooth, wide rachis—the main “stem” of the feather. University of Texas paleontologist Julia Clarke explains how the cassowary’s color could help shed light on the feathers of extinct birds and dinosaurs—and how paleontologists are investigating the evolution of birds as we see them today. The novel coronavirus SARS-CoV-2 has primarily been considered a respiratory virus, causing acute problems in the lungs. But doctors around the world have recently been reporting unusual blood clotting in some COVID-19 patients. The exact cause of these blood clots isn’t yet known—there are several interacting biological pathways that all interact to create a blood clot. One theory is that the clotting is related to an overactive immune response, producing inflammation that damages the lining of small blood vessels. Other theories point to the complement system, part of the overall immune response.  Ira speaks with hematologists Jeffrey Laurence of Weill-Cornell Medicine, and Mary Cushman of the University of Vermont Medical Center about the unusual clotting, how it impacts medical treatment, and what research they’re doing now in order to better understand what’s going on in patients.  The history of a group of people can be reconstructed through what they’ve left behind, whether that’s artifacts like pottery, written texts, or even pieces of their genome — found in ancient bones or living descendents. Scientists are now collecting genetic samples to expand the database of ancient East Asian genomes. One group examined 26 ancient genomes that provide clues into how people spread across Asia 10,000 years ago, and their results were published this month in the journal Science. Biologist Melinda Yang, an author on the study, explains how two particular groups dominated East Asia during the Neolithic Age, and how farming may have influenced their dispersal over the continent. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

The Trump administration is in the process of reversing nearly 100 environmental rules and regulations—threatening air, water, and public health. For example, in the midst of the coronavirus pandemic, the Environmental Protection Agency (EPA) has relaxed enforcement for air pollution violations, allowing emissions to continue unchecked during the spread of a respiratory illness. “We’ve never seen anything like the systematic rollback of all things environmental the way we have in this administration,” says David Uhlmann, director of the Environmental Law and Policy Program and the University of Michigan Law School in Ann Arbor. A History Of Environmental Policy Uhlmann looks back to years leading up to the push in pollution regulation in the U.S. and the establishment of the EPA in the 1970s. Some of the most catastrophic pollution events in U.S. history inspired the environmental protection efforts, from the historic Cuyahoga River fires in Ohio to the 1969 Santa Barbara oil spill. “I look at this decade, at both the challenges we face and the opportunities before us, and I’m reminded of the 1970s,” Uhlmann says. “I think we can, indeed we must, come together again around environmental issues, recognize the fact that there is no planet B. There’s no where else for us to go.” The Public Health Challenge Of Our Time Air pollution is extremely harmful to human health, especially for children. Not only do these emissions exacerbate respiratory problems, they’re linked to asthma, ADHD, depression, and low birth weight in children. Gina McCarthy, president and CEO of the Natural Resources Defense Council and former EPA administrator, calls climate change “the biggest public health challenge of our time.” But climate change does not impact everyone equally. Low-income communities are especially vulnerable to this kind of pollution, risks that are expected to get worse as climate change continues. “It’s very important to be aware of how much more affected children, everyone in low income communities, and communities of color have been,” says Frederica Perera, founding director of the Center for Children’s Environmental Health at the Columbia University Mailman School of Public Health. “They have suffered disproportionate exposure to air pollution and they’ve more vulnerable to the impacts of climate change as well.” In this chapter of Degrees of Change, Uhlmann discusses the history of environmental regulations, and how we got here. Then later in the segment, McCarthy and Perera talk about the link between EPA rollbacks, climate change, and public health. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Galileo’s Battle Against Science Denial Galileo Galilei is known as the father of observational astronomy. His theories about the movement of the Earth around the sun and his experiments testing principles of physics are the basis of modern astronomy. But he’s just as well known for his battles against science skeptics, having to defend his evidence against the political and religious critics and institutions of his time. In his new book Galileo and the Science Deniers, astrophysicist Mario Livio talks about the parallels of Galileo’s story to present-day climate change discussions, and other public scientific debates today. Monitoring Your Pandemic Health, From Your Home In recent weeks, the FDA has given the go-ahead to several tests for COVID-19 that can be performed remotely, from your own home. Such tests could help greatly expand testing capacity, an essential part of plans for recovery—but only if the tests are sensitive and reliable. Researchers are also working to develop other ways of using tech to monitor the outbreak, from heart rate monitors in smartwatches to sampling community sewage plants for evidence of the virus.   Eric Topol, the founder and director of the Scripps Research Translational Institute, joins Ira to talk about some of the technology that could be brought to bear to get a better picture of the COVID-19 pandemic. The Origin Of The Feces For some researchers, nothing is more exciting than finding fossilized feces. These ancient poops are called coprolites, and they’re quite rare. Despite their less-than-glamorous-origins, each one is a gold mine of information about who left it behind. That’s because fecal fossils are a snapshot of the microbiome from which they came. Some researchers say studying these ancient records of diet and bacteria could help us learn about modern problems such as lactose intolerance and gut inflammation.  Christina Warinner, assistant professor of anthropology at Harvard University in Cambridge, Massachusetts, joins Science Friday producer Kathleen Davis to talk coprolites, and what ancient feces can tell us about our ancestors, and ourselves.  Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.