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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 bring you a story we first released in 2022. 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.  LATERAL CUTS:From Tree to Shining Tree (https://zpr.io/4cHtDdYTuNxT): The episode that started this journey, where we look down instead of up. EPISODE CREDITS:  Reported by - Annie McEwen Produced by - Annie McEwen EPISODE CITATIONS: Videos - Inside the Fight to Save an Ancient Forest (and the Secrets it Holds) (https://zpr.io/XKipP2z4NFiM), by Michael Werner, Joe Hanson, and the PBS Overview team. We first learned about the magical world of the canopy from this beautiful video. 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!  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)! 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. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

There’s something rotten in the cows of Denmark. And Minnesota. And Wisconsin. And Idaho. What could cause a previously thriving herd of majestic dairy cattle to stop drinking water and start drinking … urine? A Danish farmer calls a special investigator, who takes one look at his farm and nopes the heck out of there, refusing to return, citing “bad energy” coming from something nearby … a big building covered in Viking runes.  It’s not magic. It’s an invisible force that’s far more common. And yet deeply mysterious. This episode plunges producers Matt Kielty and Simon Adler knee-deep in a decades-old dairy farm controversy, rooted in a fundamental suspicion of the invisible streams of electrons that keep our world humming. Special thanks to Dr. Liz Brock EPISODE CREDITS:  Reported by - Matt Kielty and Simon Adler with help from - Clara Grunnet and Rebecca Rand Produced by - Matt Kielty with help from - Maria Paz Gutierrez Original music from - Jeremy Bloom and Matt Kielty Sound design contributed by - Jeremy Bloom Mixed by - Jeremy Bloom Fact-checking by - Angely Mercado and Sophie Samiee and Edited by  - Pat Walters EPISODE CITATIONS: Books - The Great Energy Transition: America from 1876 to 1929 (https://zpr.io/3PStsDgidpj5), by David Nye Powering American Farms: The Overlooked Origins of Rural Electrification (https://zpr.io/GdQ4pMCy4DAV), by Richard Hirsch Beyond the Barn – Dodging Cow Patties for 50 Years by a Country Vet (https://zpr.io/S8qS9HLEQBJe), by Don Sanders a memoir about his long career. 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)! 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. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

In an episode first aired back in 2025 on our sister show, Terrestrials, we take you on a musical journey all about beavers. Few mammals have a bigger positive impact on the planet than the beaver. With its bright orange buck teeth, the creature is an expert engineer that brings life wherever it waddles and even fights fires. Our story begins in the Bronx river, once known as the  “open sewer” of New York City. After some humans decide to clean it up, we meet one of the river’s residents - José the beaver. We learn about the US government parachuting beavers out of planes into the mountains. And finally head to California where we discover how one beaver family saved acres of land from burning.  Special thanks to author Ben Goldfarb, Christian Murphy from the Bronx River Alliance and Dr. Emily Fairfax.  Terrestrials was created by Lulu Miller with WNYC Studios. This episode was produced by Ana González and sound-designed by Mira Burt-Wintonick. Our team includes Alan Goffinski, Joe Plourde and Tanya Chawla. Fact checking was by Diane Kelly.  Our advisors for this show were Ana Luz Porzecanski, Nicole Depalma, Liza Demby and Tovah Barocas. EPISODE CITATIONS: Books -  Eager: The Surprising, Secret Life of Beavers and Why They Matter (https://zpr.io/4QLuhrSMfurk), by Ben Goldfarb Beaverland: How One Weird Rodent Made America (https://zpr.io/3BbaViJK8Hk3), by Leila Philip’s Videos -  Watch the US government drop beavers out of planes (https://zpr.io/y2JJPwwyr3Bp).  Watch Leave It to Beavers (https://zpr.io/JVGZYmNCTy6h), a documentary about beavers restoring rivers and wetlands. Articles -  How reintroducing beavers can enhance ecological health (https://zpr.io/KNxz3MtKL9sV), by Madison Pobis, Stanford Report. Beaver Dams Help Wildfire-Ravaged Ecosystems Recover Long after Flames Subside (https://zpr.io/kAnjEUPvPUeJ), by Isobel Sandcomb, Scientific American  HEY GROWN-UPS! Love the show? Leave us a ⭐⭐⭐⭐⭐ rating and review on your podcast app—it helps curious listeners find us! We want to hear from you! Share your thoughts about Terrestrials with us.Subscribe to our weekly newsletter for bite-sized essays, activities, and ways to connect with the show.Follow us on YouTube, Instagram, and TikTok for behind-the-scenes extras and more.Listen to original music from Terrestrials on Spotify, Apple Music, or our music page. Got a badgering question for the team? Email us at terrestrialspodcast@wnyc.org or submit a voice memo with your name, age, and your question using this form! Terrestrials is made possible in part by listeners like you. Support the show by joining Radiolab’s membership program, The Lab—and we’ll send you a special thank-you gift from our team!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. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.