Stress can give your body a boost - raising adrenaline levels, pumping blood to the muscles, heightening our senses. And those sudden superpowers can be a boon when you’re running from a lion. But repeatedly dipping into that well can make you sick, even kill you. Since it feels like there’s been an extra bit of stress going around lately, we decided to replay this episode, originally aired back in 2005, which takes a long hard look at the body's system for getting out of trouble. And how in our modern, hyper-connected world, that system misfires and takes us from the frying pan, right into another, albeit entirely different, frying pan.

Stanford University neurologist (and part-time "baboonologist") Dr. Robert Sapolsky takes us through what happens on our insides when we stand in the wrong line at the supermarket, and offers a few coping strategies: gnawing on wood, beating the crap out of somebody, and having friends. Plus: the story of a singer who lost her voice, and an author stuck in a body that never grew up.

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Fantasy writer Elsa Sjunneson has been haunted by Helen Keller for nearly her entire life. Like Helen, Elsa is Deafblind, and growing up she was constantly compared to her. But for a million different reasons she hated that, because she felt different from her in a million different ways. Then, a year ago, an online conspiracy theory claiming Helen was a fraud exploded on TikTok, and suddenly Elsa found herself drawing her sword and jumping to Helen’s defense, setting off a chain of events that would bring her closer to the disability icon than she ever dreamt. For over a year, Elsa, Lulu and the Radiolab team dug through primary sources, talked to experts, even visited Helen’s birthplace Ivy Green, and discovered the real story of Helen Keller is far more complicated, mysterious and confounding than the simple myth of a young Deafblind girl rescued by her teacher Annie Sullivan. It’s a story of ghosts, surprises, a few tears, a bit of romance, some hard conversations, and a possibly psychic dog.This episode was reported by Elsa Sjunneson and Lulu Miller. It was produced by Sindhu Gnanasambandan and Rachel Cusick, with help from Sarah Qari, Tanya Chawla, and Carolyn McClusker. Jeremy Bloom contributed music and sound design. Additional Mixing by Arianne Wack.

Special thanks to Georgina Kleege, Julia Bascom, Desiree Kocis, Peter C. Kunze, Andrew Leland, Sara Luterman, Alexander Richey, Will Healy, Nate Jones, Nate Peereboom, and Pamela Sabaugh (who was our voice of Helen Keller).ASL TRANSCRIPTION

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Radiolab is on YouTube! Catch up with new episodes and hear classics from our archive. Plus, find other cool things we did in the past — like miniseries, music videos, short films and animations, behind-the-scenes features, Radiolab live shows, and more. Take a look, explore and subscribe!DOWNLOAD BRAILLE READY FILE HERE (https://zpr.io/s23JtuYxyrNA)Citations in this episodeBooks:Elsa Sjunneson, Being SeenKim Nielsen, The Radical Lives of Helen KellerGeorgina Kleege, Blind Rage: Letters to Helen KellerKatie Booth, The Invention of Miracles: language, power, and Alexander Graham Bell’s quest to end deafnessHaben Girma, Haben: The Deafblind Woman Who Conquered Harvard LawArticles:Susan Crutchfield, “Play[ing] her part correctly: Helen Keller as Vaudevillian Freak,” Disability Studies Quarterly.Desiree Kocis, “Did Helen Keller Fly A Plane?” (she did), Plane & Pilot Magazine.Peter C. Kunze, “What We Talk about When We Talk about Helen Keller,” Children’s Literature Association QuarterlyThe archives of the American Foundation for the Blind (AFB)

This week, we flip the Disney story of life on its head thanks to a barrel of seawater, a 1970s era computer, and underwater geysers. It’s the chaos of life.

Latif, Lulu, and our Senior Producer Matt Kielty were all sitting on their own little stories until they got thrown into the studio, and had their cherished beliefs about the shape of life put on a collision course. From an accidental study of sea creatures, to the ambitions of Stephen J Gould, to an undercooked theory that captured the world’s imagination, we undo the seeming order of the living world and try to make some music out of the wreckage. (Bonus: Learn how Francis Crick really thought life got started on this planet).

This episode was reported by Latif Nasser, Matt Kielty, Heather Radke, Lulu Miller and Candice Wang. It was produced by Matt Kielty and Simon Adler. Sound and music from Matt Kielty, Simon Adler, and Jeremy Bloom, and dialogue mix by Arianne Wack.Special thanks to Alan and Alida Goffinski for giving our chaos musical life in the song at the end of the episode.

Radiolab is on YouTube! Catch up with new episodes and hear classics from our archive. Plus, find other cool things we did in the past — like miniseries, music videos, short films and animations, behind-the-scenes features, Radiolab live shows, and more. Take a look, explore and subscribe!

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Citations in this episodeScientific Papers:Elisa Beninca, Reinhard Heerkloss, et al, “Chaos in a long-term experiment with a plankton community” Nature (2008)Hendrik Schubert, Reinhard Heerkloss, et al, “Chaos theory discloses triggers and drivers of plankton dynamics in a stable environment” Scientific Reports (2019)

Books:Nick Lane, The Vital Question: Energy, Evolution, and the Origins of Complex LifeFrancis Crick, Life Itself: Its Origin and NatureStephen Jay Gould: Full House: The Spread of Excellence from Plato to Darwin, and The Mismeasure of ManDavid M. Raup, Extinction: Bad Genes or Bad Luck?David Sepkoski, Rereading the Fossil Record: The Growth of Paleobiology as an Evolutionary Discipline

We live our lives at human speed, we experience and interact with the world on a human time scale. In this episode, which first aired in its entirety in the winter of 2013, we put ourselves through the paces. We examine a material that exists between two states of matter, take a ride on the death-defying roller coaster that is the stock market, open up our internal clocks of thought, and achieve mastery over the fastest thing in the universe.

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This week, we turn to an expert who tromps the wilds of wordlessness. Lulu’s young son. In this essay, originally published for The Paris Review under the title “The Eleventh Word,” Lulu explores what is lost with the gaining of language. And how, in a very odd way, a fear of confusion and the unknown may begin with the advent of words. The Radiolab sound team brings this piece to life with original music, and at one point the words melt right out of the air.

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It's hard to start a conversation with a stranger—especially when that stranger is, well, different. He doesn't share your customs, celebrate your holidays, watch your TV shows, or even speak your language. Plus he has a blowhole.

In this episode, which originally aired in the summer of 2014, we try to make contact with some of the strangest strangers on our little planet: dolphins. Producer Lynn Levy eavesdrops on some human-dolphin conversations, from a studio apartment in the Virgin Islands to a research vessel in the Bermuda Triangle.

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For much of history, tree canopies were pretty much completely ignored by science. It was as if researchers said collectively, "It's just going to be empty up there, and we've got our hands full studying the trees down here! So why bother?!"

But then, around the mid-1980s, a few ecologists around the world got curious and started making their way up into the treetops using any means necessary (ropes, cranes, hot air dirigibles) to document all they could find. It didn't take long for them to realize not only was the forest canopy not empty, it was absolutely filled to the brim with life. You've heard of treehouses? How about tree gardens?!

This week we journey up into the sky and discover Forests above the forest. We learn about the secret powers of these sky gardens from ecologist Korena Mafune, and we follow Nalini Nadkarni as she makes a ground-breaking discovery that changes how we understand what trees are capable of.

P.S. This episode is a layer cake of arboreal surprises (including the reappearance of a certain retired host).

A few visual tre(e)ats:

We first learned about the magical world of the canopy from this beautiful video from Michael Werner, Joe Hanson, and the PBS Overview team. It features Korena Mafune’s research up in the treetops, as well as the people who have dedicated their lives to saving what’s left of the old growth forests. We highly recommend checking it out! And, if you’re hankering to go climb a tree after this episode, you might enjoy browsing Hallie Bateman’s wonderfully illustrated guide to the best climbing trees in NYC for a little inspiration.Support Radiolab by becoming a member today at Radiolab.org/donate.Radiolab is on YouTube! Catch up with new episodes and hear classics from our archive. Plus, find other cool things we did in the past — like miniseries, music videos, short films and animations, behind-the-scenes features, Radiolab live shows, and more. Take a look, explore and subscribe!

Jad started Radiolab roughly 20 years ago. And now he is stepping aside from hosting and producing the show to replenish, to think, to rock in his chair and be with his kids and wife, and maybe make some music. The news has been all over twitter and there’s a letter from Jad and our hosts Latif and Lulu on the website. But in this episode, Jad talks through his decision to leave and the future of the show with Lulu and Latif. And then, as a parting gift, we play him the very first episode of Radiolab (“The Radio Lab” as he called it then). He tells us about biking the CDs over the Brooklyn bridge just before the show was supposed to air, reading the news and weather between segments, and then we just sit back together and listen to where it all began.

Jad, for those of us who have been radically changed by the thing you put out into the world, we are both sad to lose you in our ears and endlessly grateful for what you’ve given us.