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WNYC Studios

Radiolab is on a curiosity bender. We ask deep questions and use investigative journalism to get the answers. A given episode might whirl you through science, legal history, and into the home of someone halfway across the world. The show is known for innovative sound design, smashing information into music. It is hosted by Lulu Miller and Latif Nasser.

Radiolab

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)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

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/ • )

 • 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 • )

 • One of Radiolab’s most listened-to episodes of 2025!

 • 

Videos:

“Radiolab Presents: Thirty Something”
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://zpr.io/ft6dqdbkJnTd • )

 • 
 • Graph 2: 
Ovarian aging: mechanisms and clinical consequences • (
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://zpr.io/whWg2UAZsb6h • ) 

 • 
 • Graph 3 and 4: 
Age and fecundability in a North American preconception cohort study • , (
https://zpr.io/Rmqry4Kd67hY • ) Wise et al; Dutch fertility research

Further reading: 
Predicting Fertility, (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)!

Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (https://members.radiolab.org/) today.

Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing 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

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)!

Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (https://members.radiolab.org/) today.

Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing 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

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).

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)!

Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (https://members.radiolab.org/) today.

Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org.

Leadership support for Radiolab’s science programming is provided by the Gordon and Betty

The Alien in the Room

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 .

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)!

Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (https://members.radiolab.org/) today.

Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing 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.

Shell Game: Minimum Viable Company

Our original host Jad Abumrad returns to share a new podcast series he’s just released. It’s all about Fela Kuti, a Nigerian musician who created a genre, then a movement, then tried to use his hypnotic beats to topple a military dictatorship. Jad tells us about the series and why he made it, and we play the episode that, for us at least, gets to the heart of the matter: How exactly does his music work? What actually happens to the people who hear it and how does it move them to action?

You can find Jad’s entire nine-part series, Fela Kuti: Fear No Man, on Apple or Spotify, or wherever you get your podcasts.

EPISODE CREDITS: 
Reported by - Jad Abumrad
Radiolab portions produced by - Sindhu Gnanasambandan

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)!

Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (https://members.radiolab.org/) today.

Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing 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.

Fela Kuti: Enter the Shrine

Today, Lulu and Latif talk about some of their favorite episodes from Radiolab’s past that hold new power today. 

Lulu points to an episode from 2008: 

Imagine that you're a composer. Imagine getting the commission to write a song that will allow family members to face the death of a loved one. Well, composer David Lang had to do just that when a hospital in Garches, France, asked him to write music for their morgue, or 'Salle Des Departs.' What do you do? This piece was produced by Jocelyn Gonzales.

And Latif talks about an episode Jad made in 2009. Here’s how we described it back then:

Jad--a brand new father--wonders what's going on inside the head of his baby Amil.

(And don't worry, you don't need kids to enjoy this podcast.) The questions here are big: what is it like to be so brand new to the world? None of us have memories from this time, so how could we possibly ever know? Is it just chaos? Or, is there something more, some understanding from the very beginning? Jad found a development psychologist named Charles Fernyhough to explore some of his questions.

Support Radiolab by becoming a member today at Radiolab.org/donate.

Deep Cuts

While most of us hear a wall of white noise, squeaks, and squawks....David Rothenberg hears a symphony. He's trained his ear to listen for the music of animals, and he's always looking for chances to join in, with everything from lonely birds to giant whales to swarming cicadas.

In this podcast, David explains his urge to connect and sing along, and helps break down the mysterious life cycle and mating rituals of the periodical cicadas into something we can all relate to.

Support Radiolab by becoming a member today at Radiolab.org/donate.

The Septendecennial Sing-Along

Love it or hate it, the freedom to say obnoxious and subversive things is the quintessence of what makes America America. But our say-almost-anything approach to free speech is actually relatively recent, and you can trace it back to one guy: a Supreme Court justice named Oliver Wendell Holmes. Even weirder, you can trace it back to one seemingly ordinary 8-month period in Holmes’s life when he seems to have done a logical U-turn on what should be say-able. Why he changed his mind during those 8 months is one of the greatest mysteries in the history of the Supreme Court. (Spoiler: the answer involves anarchists, a house of truth, and a cry for help from a dear friend.) Join us as we investigate why he changed his mind, how that made the country change its mind, and whether it’s now time to change our minds again.

This episode was reported by Latif Nasser and was produced by Sarah Qari.

Special thanks to Jenny Lawton, Soren Shade, Kelsey Padgett, Mahyad Tousi and Soroush Vosughi.

Support Radiolab by becoming a member today at Radiolab.org/donate. 

 

further reading:

Thomas Healy’s book The Great Dissent: How Oliver Wendell Holmes CHanged His Mind - And Changed the History of Free Speech In America (the inspiration for this episode) plus his latest book Soul City: Race, Equality and the Lost Dream of an American Utopia.

The Science article that Sinan Aral wrote in 2018, along with Soroush Vosughi and Deb Roy: “The Spread of True and False News Online”

Sinan Aral’s recent book The Hype Machine: How Social Media Disrupts Our Elections, Our Economy and our Health - And How We Must Adapt

Zeynep Tufekci’s newsletter “The Insight” plus her book Twitter and Teargas: The Power and Fragility of Networked Protest

Nabiha Syed’s news website The Markup

Trailer for “The Magnificent Yankee,” a 1950 biopic of Oliver Wendell Holmes

Anthony Lewis, Freedom for the Thought that We Hate: A Biography of the First Amendment

What Up Holmes?

Scientists took about 300 years to lay out the Periodic Table into neat rows and columns. In one hour, we’re going to mess it all up. This episode, we enlist journalists, poets, musicians, and even a physicist to help us tell stories of matter that matters. You’ll never look at that chart the same way again.

Special thanks to Emotive Fruition for organizing poetry performances and to the mighty Sylvan Esso for composing 'Jaime's Song', both inspired by this episode.

Thanks also to Sam Kean, Chris Howk, Brian Fields and to Paul Dresher and Ned Rothenberg for the use of their song "Untold Story:The Edge of Sleep". 

Check out Jaime Lowe's book Mental: Lithium, Love and Losing My Mind

Support Radiolab by becoming a member today at Radiolab.org/donate.

Elements

As we hit the one year mark since the first U.S. state (California) issued a stay-at-home order to prevent the spread of COVID-19, we put out a call to see if any of you would take us to your secret escape spot and record audio there.

And you astounded us with what you brought in. 

In this soundrich, kaleidoscopic episode, we journey around the planet and then, quite literally, beyond it. Listen only if you want a boatload of fresh air, fields of wildflowers, stars, birds, frogs, and a riveting tale involving Isaac Newton and a calm beyond any calm you knew could exist.

This episode was produced by Matt Kielty and Lulu Miller, with production support from Jonny Moens and Suzie Lechtenberg. 

Special thanks to:

Lynn Levy, who went on to host the space-a-licious series, The Habitat, and edit (among other things) the powerful and beautiful new podcast Resistance.

Merav Opher, an astronomy professor at BU, who now directs the SHIELD DRIVE Science Center which is studying the data collected by the Voyagers at the edge of the heavens, or--err, the “heliosphere” as the scientists call it.

Edward Dolnick, The Clockwork Universe: Isaac Newton, the Royal Society, and the Birth of the Modern World

Ann Druyan, one of the creators of the 1977 Golden Album traveling on the Voyager probe, has recently released a new series on National Geographic, “Cosmos: Possible Worlds”

A.J. Dungo, who submitted a postcard while surfing, is author of the mesmerizing graphic novel, In Waves, a memoir about surfing and grief.

Support Radiolab by becoming a member today at Radiolab.org/donate.

Escapescape

Until now, the fastest vaccine ever made - for mumps - took four years. And while our current effort to develop a covid-19 vaccine involves thousands of people working around the clock, the mumps vaccine was developed almost exclusively by one person: Maurice Hilleman. Hilleman cranked out more than 40 other vaccines over the course of his career, including 8 of the 14 routinely given to children. He arguably saved more lives than any other single person. And through his work, Hilleman embodied the instincts, drive, and guts it takes to marshall the human body’s defenses against a disease. But through him we also see the struggle and the costs of these monumental scientific efforts.

This episode was reported by Matt Kielty and Heather Radke, and produced by Matt Kielty.

Support Radiolab by becoming a member today at Radiolab.org/donate.

The Great Vaccinator

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