Science Friday

Earlier this summer, astronomers discovered something strange whizzing past Jupiter: an interstellar object. Scientists named it 3I/ATLAS. It’s only the third interstellar object ever observed, and it’s due to leave the solar system by the end of the year, so the race is on to learn as much as we can about it. Host Flora Lichtman talks with astrochemist Stefanie Milam about what this object could teach us about other solar systems—and ours.And, for the past two years, researchers have been studying samples from the near-Earth asteroid Bennu, trying to tease out details about its origins, and what they tell us about our solar system. Researcher Jessica Barnes describes a new analysis of Bennu samples that found stardust, the residue of ancient exploding stars, older than our solar system.Guests: Dr. Stefanie Milam is an astrochemist at NASA and a project scientist for the James Webb Space Telescope. Dr. Jessica Barnes is an associate professor in the Lunar and Planetary Laboratory at the University of Arizona.Transcripts for each episode are available within 1-3 days at sciencefriday.com.Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

You have probably given some thought to outdoor air pollution, whether it’s wildfire smoke or smog from traffic. You may even check AQI measurements on your phone. But what about the air inside your home? Host Flora Lichtman talks to civil and environmental engineer Nusrat Jung, who studies indoor air pollution, about how we create toxic air without even knowing it, and what we can do to avoid it. Guest: Dr. Nusrat Jung is a civil and environmental engineer at Purdue University.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

In some places, sand dunes protect shorelines from the onslaught of ocean waves. In other places, the dunes themselves are on the move, and threaten human structures.Host Flora Lichtman talks with mechanical engineer Nathalie Vriend, who studies the structure of sand dunes, about what makes a heap of sand a dune, and what scientists still hope to learn about sand.Guest: Dr. Nathalie Vriend is an associate professor in mechanical engineering and leader of the Granular Flow Laboratory at the University of Colorado in Boulder.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Summer may be winding down, but we’re not quite ready to let go of beach days, backyard cookouts, or ice cream cones. We love ice cream here at SciFri, so we’re pulling a few of our favorite ice cream science stories out of the freezer this week.Back in 2015, ice cream expert Maya Warren sat down with Host Ira Flatow to help us understand a science mystery of “unmeltable” ice cream that made the evening news in Cincinnati.That same summer, Ira spoke to Jeff Potter, author of Cooking for Geeks, and Brian Smith, founder of Ample Hills Creamery, who give us science-backed tips for making smooth, velvety ice cream at home.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Twenty years ago, Hurricane Katrina made landfall in Louisiana, and the levees designed to protect New Orleans failed. Huge swaths of the city flooded, and 1,600 people were trapped inside Charity Hospital. Physician Erica Fisher was working in Charity’s emergency room at the time, and she and her colleagues fought for days to keep their patients alive.Host Flora Lichtman speaks with Dr. Fisher, now an emergency medicine physician at University Medical Center in New Orleans, about Hurricane Katrina and the vulnerability of our healthcare systems in the face of disasters.Plus, science writer Maggie Koerth joins Flora to share other science news the week, including the link between heat waves and aging, updated COVID vaccine guidelines, the ancient origins of human mucus, and the possibility that dwarf planet Ceres could once have sustained life.Guest: Dr. Erica Fisher is an emergency medicine physician at University Medical Center in New Orleans, Louisiana.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Researchers recently used near-infrared photography to get a detailed look at ancient artwork showing scenes of wild animals tangled in a fight. But these weren’t paintings on a cave wall. They were tattoos on the arms of a Siberian woman who lived 2,300 years ago. What can ancient ink tell us about our ancestors? Sticking and poking their way into this with Host Flora Lichtman are archaeologist Aaron Deter-Wolf and his research collaborator, tattoo artist Danny Riday.Guests: Aaron Deter-Wolf is an archaeologist for the Tennessee Division of Archaeology in Nashville, Tennessee.Danny Riday is a tattoo artist and independent researcher based in Les Eyzies, France.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

You might think of a star as a mass of incandescent gas, a gigantic nuclear furnace where hydrogen is turned into helium at a temperature of millions of degrees. But researchers recently reported that they’d observed some of what lies beneath all that hydrogen and helium, at least inside one unusual supernova. The star, named supernova 2021yfj, had its outer layers stripped away, leaving behind a silicon- and sulfur-rich inner shell.Astrophysicist Steve Schulze joins Host Flora Lichtman to describe what the team spotted in the heart of a dying star.Guest: Dr. Steve Schulze is a research associate at Northwestern University’s Center for Interdisciplinary Exploration and Research in Astrophysics.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Gray wolves are native to the Rocky Mountains, but decades of hunting nearly eradicated them from the western United States by the 1940s. In 1995, wolves were reintroduced to Yellowstone National Park, and it’s been a conservation success story, but not a straight path out of the woods.Host Flora Lichtman digs into the last 30 years of wolves in the West with Heath Druzin, creator of the podcast “Howl,” from Boise State Public Radio and The Idaho Capital Sun. Druzin reported the podcast and companion written series with Clark Corbin.Guest: Heath Druzin is host of the podcast “Howl,” from Boise State Public Radio and The Idaho Capital Sun.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

What do Flamin’ Hot Cheetos, lime Jell-O, and Kraft Creamy French Salad dressing have in common? They've all gotten a glow-up from artificial food dyes. Petroleum-based food dyes have become a target of RFK Jr.’s “Make America Healthy Again” agenda—but what does science say about their effects on health? Joining Host Flora Lichtman to discuss is Asa Bradman, an expert in the health effects of food dyes and other things we’re exposed to in our environment.Guest:Dr. Asa Bradman is a professor of public health at the University of California Merced based in Merced, California.Transcripts for each segment will be available after the show airs on sciencefriday.com.Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

This month, the Department of Health and Human Services terminated almost $500 million in mRNA vaccine development grants and contracts. While HHS has said that these cuts won't affect mRNA cancer research, some researchers have expressed concern about the impact on their ongoing work. In light of these developments, we’re revisiting a conversation from February.A team at Memorial Sloan Kettering is developing an mRNA vaccine for pancreatic cancer, which is notoriously difficult to treat. A few years ago, the team embarked on a small trial to test the vaccine’s safety. Sixteen patients with pancreatic cancer received it, and half of them had a strong immune response. A follow-up study found that in six of those patients, the cancer hadn’t relapsed after three years.Host Flora Lichtman spoke to study author Vinod Balachandran about the work, which has not yet been affected by the cuts, according to Memorial Sloan Kettering.Guest: Dr. Vinod Balachandran is an associate attending surgeon and Director of The Olayan Center for Cancer Vaccines at Memorial Sloan Kettering in New York, New York.Transcripts for each segment will be available after the show airs on sciencefriday.com.  Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Since President Trump returned to office, his administration has been aggressive in rolling back clean energy initiatives. But that isn’t the whole story. Texas, California, and other states are bringing so much solar and battery power online that in March, fossil fuels generated less than half the electricity in the US for the first time ever. And internationally, solar has gotten so cheap to build and install that it’s fundamentally transforming many countries’ power grids. So where exactly does solar adoption stand in the US and across the world right now?Climate activist Bill McKibben joins Host Ira Flatow to talk about the recent wins and future challenges that sun-powered energy faces, which he writes about in his new book Here Comes The Sun: A Last Chance for the Climate and a Fresh Chance for Civilization.Guest: Bill McKibben is a climate activist and founder of Third Act. He’s based in Middlebury, Vermont.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Fireflies’ magical blinking lights are tiny beacons in the warm dark night. Who can resist catching one? Not scientists.Because their light comes from bodily chemicals, fireflies’ power of illumination has long been used as a tool in medical research. And that has driven scientists to investigate the inner workings of the blinking beetle itself. Researchers have recently discovered that fireflies’ glowing lanterns are only one of the ways they communicate.Host Ira Flatow talks with entomologist Sarah Lower and biochemist Stephen Miller about the latest advances in firefly science.Guests: Dr. Sarah Lower is an associate professor of biology at Bucknell University where she studies fireflies.Dr. Stephen Miller is a professor of biochemistry and molecular biotechnology at the UMass Chan Medical School.Transcripts for each episode are available within 1-3 days at sciencefriday.com.  Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Throughout history, humans have been on a search for truth. From the ancient Greeks and their belief in a universal truth, to our Founding Fathers writing, “We hold these truths to be self-evident, that all men are created equal.” In a world of disinformation, conspiracy theories, and the rising influence of artificial intelligence, where does truth fit in? Mathematician Adam Kucharski, author of Proof: The Art and Science of Certainty, joins Host Ira Flatow to discuss the complicated truth.Read an excerpt of Proof: The Art and Science of Certainty.Guest:Dr. Adam Kucharski is a mathematician and author of Proof: The Art and Science of Certainty. He is based in London.Transcripts for each episode are available within 1-3 days at sciencefriday.com.  Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Did you know that murder mystery writer Agatha Christie had a background in chemistry? In about half of her stories, the murder is committed using poison—something she was very, very familiar with. She had even trained in apothecaries to mix prescriptions by hand before she became a novelist. Chemist-turned-author Kathryn Harkup wrote about them in her new book, V is for Venom: Agatha Christie’s Chemicals of Death. Harkup talks with Host Flora Lichtman about the science of poisons, why they’re so popular in whodunnits, and how to get away with murder (in fiction writing, of course).Guest: Kathryn Harkup is a former chemist and author of V is for Venom: Agatha Christie’s Chemicals of Death.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

On August 5, Health Secretary Robert F. Kennedy Jr. announced that the Department of Health and Human Services would terminate almost $500 million in mRNA vaccine development grants and contracts, affecting 22 projects. Biologist and mRNA researcher Jeff Coller joins Host Ira Flatow to talk about what this move means for future mRNA research in the US beyond these immediate projects.Plus, reporter Casey Crownhart joins Ira to discuss the latest in climate news, including flooding in Juneau, Alaska; how Ford is pursuing further electric vehicle manufacturing despite federal roadblocks; and a startup using Earth itself as a giant battery.Guests:Dr. Jeff Coller is the Bloomberg Distinguished Professor of RNA Biology and Therapeutics at Johns Hopkins University.Casey Crownhart is a senior climate reporter for MIT Technology Review in New York, New York.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

If you’ve found yourself scrolling through the breastfeeding world online, you know that people have a lot of strong opinions about breast milk. But what exactly do we know about the biology of it? Does breast milk really adapt to a baby’s needs? Does it confer immunity? How does making breast milk impact the breastfeeder? Joining Host Flora Lichtman to spin through the science of this sophisticated substance are experts Shelley McGuire and Deepshika Ramanan.Guests: Dr. Shelley McGuire is the director of the Margaret Ritchie School of Family and Consumer Sciences at the University of Idaho.Dr. Deepshika Ramanan is an assistant professor at the Salk Institute for Biological Studies.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Science journalist Tom Zeller Jr. has suffered from debilitating cluster headaches for three decades. Like other cluster headache sufferers, his episodes would leave him unable to function, and the fear of the next one happening was constant. In a quest to better understand his own condition, Zeller learned that headaches remain a great neurological mystery, with basic mechanisms behind why they happen still unknown. He joins Host Flora Lichtman to talk about his new book, The Headache: The Science of a Most Confounding Affliction – and a Search for Relief.Guest:Tom Zeller Jr. is editor in chief of Undark and author of the book The Headache: The Science of a Most Confounding Affliction – and a Search for Relief. He’s based in Montana.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Last week, astronaut James Lovell died at the age of 97. In April of 1970, he was the commander of the Apollo 13 mission, which launched with three astronauts en route to the moon. While in space, however, the craft encountered a serious problem: an explosion in one of its fuel tanks that severely damaged the craft and disabled its electrical system, prompting the famous phrase, “Houston, we’ve had a problem.” In 1995, on the occasion of the 25th anniversary of the mission, Host Ira Flatow spoke with Lovell about the historic flight and how good luck and ingenuity among the crew and mission controllers on the ground combined to bring the Apollo 13 astronauts safely back to Earth.Guest:James Lovell was a NASA astronaut and commander of the Apollo 13 mission.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

Fungal networks in the soil are arguably the basis of much of life on Earth, but they’re understudied and underappreciated in the conservation world. Scientists at the Society for the Protection of Underground Networks (SPUN) are trying to fix that. They just unveiled a global map of mycorrhizal fungal networks, which highlights how widespread they are and how little protection they have. Host Flora Lichtman talks with two of the SPUN mapmakers, Adriana Corrales and Michael Van Nuland, about the importance of fungal networks and why they need more protection.Guests: Dr. Adriana Corrales is a forest ecologist and scientist with the Society for the Protection of Underground Networks. She’s based in Bogotá, Colombia.Dr. Michael Van Nuland is an ecologist and scientist with the Society for the Protection of Underground Networks. He’s based in Portland, Oregon.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.

The mechanisms behind Alzheimer’s disease have eluded scientists for decades. But a new breakthrough points to lithium as a possible explanation—not only does it occur naturally in the brain, but a deficiency causes dementia in mice. This research is one of thousands of projects that have lost funding due to President Trump’s cuts to the National Institutes of Health (NIH). Host Ira Flatow speaks with Alzheimer’s researcher Bruce Yankner about this new finding, and then to epidemiologist Katelyn Jetelina and immunologist Elisabeth Marnik about the country’s “quiet engine of science,” the NIH.Guests: Dr. Bruce Yankner is professor of genetics and neurology at Harvard Medical School in Boston, Massachusetts.Dr. Katelyn Jetelina, epidemiologist and author of the Your Local Epidemiologist newsletter. She’s based in San Diego.Dr. Elisabeth Marnik is an immunologist and Director of Science Education & Outreach at the MDI Biological Laboratory in Bar Harbor, Maine.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.