If you’re a moth trying to stay uneaten, there are competing strategies. Some moths rely on camouflage, trying to blend in. Other moths take the opposite approach: They’re bold and bright, with colors that say “don’t eat me, I’m poison.” Biologist Iliana Medina joins Host Flora Lichtman to describe a study that placed some 15,000 origami moths in forests around the world to investigate which strategy might work best. 

Then, mammologist Anderson Feijó and evolutionary biologist Rafaela Missagia join Flora to dive into another evolutionary conundrum: why so many rodents have thumbnails. 

Guests: Dr. Iliana Medina Guzman is a Senior Lecturer in the School of BioSciences at the University of Melbourne in Australia.
Dr. Anderson Feijó is a mammal curator at the Field Museum in Chicago. 
Dr. Rafaela Missagia is an assistant professor at the University of São Paulo in Brazil.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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Our country’s public health system is ailing. With layoffs and leadership changes at the CDC, changing vaccine guidelines, a government shutdown, and declining public trust—where do we go from here? Can state and local public health agencies pick up the slack? Are there other solutions?

Host Flora Lichtman talks with former CDC director Tom Frieden to put these questions into perspective.

Guest: Dr. Tom Frieden is a former CDC director, president and CEO of Resolve to Save Lives, and author of The Formula for Better Health: How to Save Millions of Lives—Including Your Own.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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There’s fresh drama in the field of human origins! A new analysis of an ancient hominid skull from China challenges what we thought we knew about our ancestral family tree, and its timeline—at least according to the researchers who wrote the paper. The new study claims that Homo sapiens, and some of our relatives, could have emerged at least half a million years earlier than we thought. But big claims require big evidence.

Anthropologist John Hawks joins Host Flora Lichtman to piece together the details.

Guest: Dr. John Hawks is an anthropologist and professor at the University of Wisconsin-Madison.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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Jane Goodall, renowned primatologist, conservationist, and humanitarian, died on October 1 at the age of 91. Goodall was born in London in 1934, and her curiosity about the natural world led her to the forests of Gombe, Tanzania, where she made groundbreaking observations of chimpanzee behavior, including tool use. Her research challenged the accepted scientific perceptions of our closest relatives.

Host Ira Flatow shares his memories of Dr. Goodall, including an interview from 2002 in which she discussed her life and work.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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Roughly 1 in 10 Americans take antidepressants. The most common type is SSRIs, or  selective serotonin re-uptake inhibitors, like Prozac, Lexapro, and Zoloft. But what happens when you stop taking them? Studies don’t point to a single conclusion, and there’s ongoing debate among physicians and patients about the severity and significance of SSRI withdrawal symptoms. The discourse reached a fever pitch when Health Secretary Robert F. Kennedy Jr. compared SSRI withdrawal to heroin withdrawal in January.

Host Flora Lichtman digs into the data on SSRI withdrawal with psychiatrists Awais Aftab and Mark Horowitz.

Guests: Dr. Awais Aftab is a clinical associate professor of psychiatry at Case Western Reserve University.
Dr. Mark Horowitz is a clinical research fellow in the UK’s National Health Service and  scientific co-founder of Outro Health.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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The tropical waters of Sri Lanka, an island off the coast of India, are home to a population of blue whales unlike any other. These whales stay put, while every other known population migrates. That discovery was made by budding scientist Asha de Vos more than 20 years ago—it made a splash, and so did she. She later became the first Sri Lankan to earn a PhD studying marine mammals, charting a new scientific path in her country.

Host Flora Lichtman talks with de Vos about her path into science, what it means to be the first Sri Lankan in her field, and how she built a marine biology program from the ground up.

Guest: Dr. Asha de Vos is a marine biologist and the founder and executive director of the non-profit Oceanswell. She’s based in Sri Lanka.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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In mid-September, artists from around the country convened in Laurel, Maryland, for one of the splashiest events in the wildlife art world: the Federal Duck Stamp Art Contest. At the annual event, artists compete to have their excruciatingly detailed waterfowl painting appear on the Federal Duck Stamp, which is a waterfowl hunting license. This year, Digital Producer Emma Gometz was there to watch the duck drama unfold. They join Host Flora Lichtman to explain why artists take this competition so seriously, how duck stamps support conservation, and who took the crown this year.

Read our article about the 2025 competition.

Plus, Interlochen Public Radio reporter Claire Keenan-Kurgan shares the story of a volunteer group determined to bring one of the world’s rarest flowers back to a small river island in Illinois.

Guests: Emma Gometz is Science Friday’s Digital Producer of Engagement. They write SciFri’s “Science Goes To The Movies” series and are a journalist and illustrator based in Queens, NY.
Claire Keenan-Kurgen is a reporter for Interlochen Public Radio in northern Michigan.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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Football season is well underway, and fans know those athletes get hit hard. Could better helmets and guidelines around concussion prevention someday eliminate head injuries from the sport? 

Host Flora Lichtman speaks with concussion doctor Michael Collins and helmet specialist Barry Miller about how our understanding of head injuries and equipment has evolved. 

Guests:  Dr. Michael Collins is the clinical and executive director of the Sports Medicine Concussion Program at the University of Pittsburgh Medical Center.
Dr. Barry Miller is the director of outreach at the Virginia Tech Helmet Lab.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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At a news conference on September 22, President Trump claimed that taking acetaminophen, the active ingredient in Tylenol, during pregnancy “can be associated with a very increased risk of autism.” Many experts have pushed back on the statement, saying it’s a false claim that downplays the risks of fever during pregnancy, which Tylenol may be used to treat.

Autistic people and their families also raised concerns about the language used and the premise that autism is a scourge that needs to be eliminated.

Host Flora Lichtman digs into what we know about acetaminophen use during pregnancy with epidemiologist Brian Lee, who led one of the largest peer-reviewed studies looking at the link between acetaminophen use during pregnancy and autism in children.

Guest: Dr. Brian Lee is a professor of epidemiology at Drexel University, based in Philadelphia, Pennsylvania.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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Robots are just about everywhere these days: circling the grocery store, cleaning the floor at the airport, making deliveries. Not to mention the robots on the assembly lines in factories. But how far are we from having a human-like robot at home? For example, a robot housekeeper like Rosie from “The Jetsons.” She didn’t just cook and clean, she bantered and bonded with the Jetsons. 

Stanford roboticist Karen Liu joined Host Ira Flatow to talk about how AI is driving advances in humanoid robotics at a live show at the Fox Theatre in Redwood City, California.

Guest: Dr. Karen Liu is a professor of computer science at Stanford University.

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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