Radiolab

Moon Trees

In 1971, a red-headed, tree-loving astronaut named Stu ‘Smokey’ Roosa was asked to take something to the moon with him. Of all things, he chose to take a canister of 500 tree seeds. After orbiting the moon 34 times, the seeds made it back to Earth. NASA decided to plant the seeds all across the country and then… everyone forgot about them. Until one day, a third grader from Indiana stumbled on a tree with a strange plaque: "Moon Tree." This discovery set off a cascading search for all the trees that visited the moon across the United States. Science writer, and our very own factchecker, Natalie Middleton ( [https://www.nataliemiddleton.org/]https://www.nataliemiddleton.org/) tells us the tale. Read Lulu’s remembrance of Alice Wong for Transom.org [http://transom.org]: 13 questions I’ll never get to ask Alice Wong [https://transom.org/2026/13-questions-ill-never-get-to-ask-alice-wong/] (https://transom.org/2026/13-questions-ill-never-get-to-ask-alice-wong/ [https://transom.org/2026/13-questions-ill-never-get-to-ask-alice-wong/]).  Check out Natalie’s map to find your nearest moon tree on our show page [https://radiolab.org/podcast/the-travelers-how-moon-trees-hide-among-us] (https://radiolab.org/podcast/moon-trees)! Help us hunt for more moon trees. If you know of an undocumented moon tree, contact Natalie at nataliemiddleton.org [http://nataliemiddleton.org]. Check out Natalie’s essay on Moon Trees [https://orionmagazine.org/article/moon-tree/] (https://orionmagazine.org/article/moon-tree/) and Space Zinnias [https://orionmagazine.org/article/astronaut-scott-kelly-flower-experiment-space/] (https://orionmagazine.org/article/astronaut-scott-kelly-flower-experiment-space/) in Orion Magazine [https://orionmagazine.org/] (https://orionmagazine.org/). Visit NASA’s official Moon Tree Page [https://science.nasa.gov/resource/apollo-moon-trees/] (https://science.nasa.gov/resource/apollo-moon-trees/) for a list of all the Apollo 14 Moon Trees in the world.  To learn more about Stu Roosa or to learn more about acquiring your own half Moon Tree, check out the Moon Tree Foundation [https://www.moontreefoundation.com/] (https://www.moontreefoundation.com/), spearheaded by Stu’s daughter, Rosemary Roosa.  A reminder that Terrestrials also makes original music! You can find ‘Tangled in the Roots’ and all other music from the show here [https://www.wnycstudios.org/podcasts/radiolab-kids/just-the-songs](https://www.wnycstudios.org/podcasts/radiolab-kids/just-the-songs). EPISODE CREDITS:  Terrestrials was created by Lulu Miller with WNYC Studios. This episode was produced by Tanya Chawla and sound-designed by Joe Plourde. Our Executive Producer is Sarah Sandbach. Our team includes Alan Goffinski, Ana González and Mira Burt-Wintonick. Fact checking was by Diane Kelly.  Special thanks to Sumanth Prabhaker from Orion magazine, retired NASA Scientist Dr. Dave Williams, Joan Goble, Tre Corely and NASA scientist Dr. Marie Henderson. Our advisors for this show were Ana Luz Porzecanski, Nicole Depalma, Liza Demby and Carly Ciarrocchi. Support for Terrestrials also comes from the Simons Foundation, the Arthur Vining Davis Foundations, and the John Templeton Foundation. Signup for our newsletter!! It includes short essays, recommendations, and details about other ways to interact with the show. Sign up [https://radiolab.org/newsletter] (https://radiolab.org/newsletter)! Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab [http://members.radiolab.org] (https://members.radiolab.org/) today. Follow our show on Instagram [http://instagram.com/radiolab], Twitter [http://twitter.com/radiolab] and Facebook [http://facebook.com/radiolab] @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org [radiolab@wnyc.org]. Leadership support for Radiolab’s science programming is provided by the Simons Foundation and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.

Fertility Cliff

As she -- and her friends — approached the age of 35, senior correspondent Molly Webster kept hearing a phrase over and over: “fertility cliff.” It was a short-hand term to describe what she was told would happen to her fertility after she turned 35 — that is, it would drop off. Suddenly, sharply, dramatically. And this was well before she was supposed to hit menopause. Intrigued, Molly decided to look into it — what was the truth behind this so-called cliff, and when, if so, would she topple?  This story first premiered in “Thirty Something,” a 2018 Radiolab live show that was part of, Gonads [https://radiolab.org/series/radiolab-presents-gonads/], (https://radiolab.org/series/radiolab-presents-gonads [https://radiolab.org/series/radiolab-presents-gonads])a six-episode audio and live event series all about reproduction and the parts of us that make more of us. The live event was produced by Rachael Cusick and edited by Pat Walters. Special thanks to epidemiologist Lauren Wise, at Boston University. Plus, Emily, Chloe, and Bianca. And of course, Jad Abumrad. If you’re more of a visual person, here are the graphs we explain in the episode, we also include links to the corresponding papers in our Episode Citations Section, below! LINK TO GRAPHS: https://media.wnyc.org/i/1860/1046/c/80/2025/12/FERTILITY_AGE_GRAPHS_1-4.jpg [https://media.wnyc.org/i/1860/1046/c/80/2025/12/FERTILITY_AGE_GRAPHS_1-4.jpg] EPISODE CREDITS:  Reported by - Molly Webster Produced by - Arianne Wack Fact-checking by - Diane A. Kelly EPISODE CITATIONS: Audio: * Gonads [https://radiolab.org/series/radiolab-presents-gonads/] (https://radiolab.org/series/radiolab-presents-gonads/ [https://radiolab.org/series/radiolab-presents-gonads/]) A six-part audio series on reproduction and the parts of us that make more of us * The Menopause Mystery [https://radiolab.org/podcast/the-menopause-mystery] (https://radiolab.org/podcast/the-menopause-mystery [https://radiolab.org/podcast/the-menopause-mystery]) One of Radiolab’s most listened-to episodes of 2025!   Videos: “Radiolab Presents: Thirty Something” https://youtu.be/LOJVAaSwags?si=czCBraHf1JEqmAQi [https://youtu.be/LOJVAaSwags?si=czCBraHf1JEqmAQi] Research Articles: * Graph 1: Can assisted reproduction technology compensate for the natural decline in fertility with age? A model assessment [https://academic.oup.com/humrep/article-abstract/19/7/1548/2356634?redirectedFrom=fulltext&login=false] (https://zpr.io/ft6dqdbkJnTd [https://zpr.io/ft6dqdbkJnTd])   * Graph 2: Ovarian aging: mechanisms and clinical consequences [https://pubmed.ncbi.nlm.nih.gov/19589949/] (https://zpr.io/GrPLebynpvxV [https://zpr.io/GrPLebynpvxV]) , Brookmans, et al. * BUT, the graph was borrowed and actually comes from this 1991 paper, Delaying childbearing: effect of age on fecundity and outcome of pregnancy [https://pmc.ncbi.nlm.nih.gov/articles/PMC1670055/?page=3]” (https://zpr.io/whWg2UAZsb6h [https://zpr.io/whWg2UAZsb6h])    * Graph 3 and 4: Age and fecundability in a North American preconception cohort study [https://pmc.ncbi.nlm.nih.gov/articles/PMC3672329/], (https://zpr.io/Rmqry4Kd67hY [https://zpr.io/fWUX8mXdzGUG]) Wise et al; Dutch fertility research Further reading:  Predicting Fertility [https://www.bu.edu/articles/2014/predicting-fertility/], (https://zpr.io/YEdfiYT29rUh [https://zpr.io/YEdfiYT29rUh]): Magazine article on Lauren Wise’s research,   Sign up for our newsletter!! It includes short essays, recommendations, and details about other ways to interact with the show. Signup [https://radiolab.org/newsletter] (https://radiolab.org/newsletter)! Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab [http://members.radiolab.org] (https://members.radiolab.org/) today. Follow our show on Instagram [http://instagram.com/radiolab], Twitter [http://twitter.com/radiolab] and Facebook [http://facebook.com/radiolab] @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org [radiolab@wnyc.org]. Leadership support for Radiolab’s science programming is provided by the Simons Foundation and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.

The Good Show

The standard view of evolution is that living things are shaped by cold-hearted competition. And there is no doubt that today's plants and animals carry the genetic legacy of ancestors who fought fiercely to survive and reproduce. But in this hour that we first broadcast back in 2010, we wonder whether there might also be a logic behind sharing, niceness, kindness ... or even, self-sacrifice. Is altruism an aberration, or just an elaborate guise for sneaky self-interest? Do we really live in a selfish, dog-eat-dog world? Or has evolution carved out a hidden code that rewards genuine cooperation? Sign up for our newsletter!! It includes short essays, recommendations, and details about other ways to interact with the show. Sign up [https://radiolab.org/newsletter] (https://radiolab.org/newsletter)! Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab [http://members.radiolab.org] (https://members.radiolab.org/) today. Follow our show on Instagram [http://instagram.com/radiolab], Twitter [http://twitter.com/radiolab] and Facebook [http://facebook.com/radiolab] @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org [radiolab@wnyc.org]. Leadership support for Radiolab’s science programming is provided by the Simons Foundation and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.

The Alien in the Room

It’s faster than a speeding bullet. It’s smarter than a polymath genius. It’s everywhere but it’s invisible. It’s artificial intelligence. But what actually is it? Today we ask this simple question and explore why it’s so damn hard to answer. Special thanks to Stephanie Yin and the New York Institute of Go for teaching us the game. Mark, Daria and Levon Hoover Brauner for helping bring NETtalk to life.  And a huge thank you to Grant Sanderson for his unending patience explaining the math of neural nets to us. To learn more about how these 'thinking machines' actually think, we highly recommend his wonderful youtube channel 3Blue1Brown (https://www.youtube.com/watch?v=aircAruvnKk) [https://www.youtube.com/watch?v=aircAruvnKk]. EPISODE CREDITS:  Reported by - Simon Adler Produced by - Simon Adler Original music from - Simon Adler Sound design contributed by - Simon Adler Fact-checking by - Anna Pujol-Mazzini  Sign up for our newsletter!! It includes short essays, recommendations, and details about other ways to interact with the show. Signup [https://radiolab.org/newsletter] (https://radiolab.org/newsletter)! Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab [http://members.radiolab.org] (https://members.radiolab.org/) today. Follow our show on Instagram [http://instagram.com/radiolab], Twitter [http://twitter.com/radiolab] and Facebook [http://facebook.com/radiolab] @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org [radiolab@wnyc.org]. Leadership support for Radiolab’s science programming is provided by the Gordon and Betty

Shell Game: Minimum Viable Company

A year ago we brought you a show called Shell Game where a journalist named Evan Ratliff made an AI copy of himself. Now on season 2 of the show, Evan’s using AI to do more than just mimic himself — he’s starting a company staffed entirely by AI agents, and making a podcast about the experience. The show is a smart, funny, and truly bizarre look at what AI can do—and what it can’t.  This week we bring you the first episode of Shell Game Season Two, Minimum Viable Company. You can sign up to get the rest of the Shell Game ad-free, and the Shell Game newsletter, at shellgame.co [http://shellgame.co] . EPISODE CREDITS:  Shell Game  Hosted by Evan Ratliff,  Produced and edited by Sophie Bridges.  Shell Game’s Technical Advisor Matty Bohacek  Executive Produced by Samantha Henig, Kate Osborn and Mangesh Hattikudur at Kaleidoscope and Katrina Norvell at IHeart Podcasts. Radiolab portions  Hosted by Simon Adler  Produced by Mona Madgavkar. Sign up for our newsletter!! It includes short essays, recommendations, and details about other ways to interact with the show. Signup [https://radiolab.org/newsletter] (https://radiolab.org/newsletter)! Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab [http://members.radiolab.org] (https://members.radiolab.org/) today. Follow our show on Instagram [http://instagram.com/radiolab], Twitter [http://twitter.com/radiolab] and Facebook [http://facebook.com/radiolab] @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org [radiolab@wnyc.org]. Leadership support for Radiolab’s science programming is provided by the Simons Foundation and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.