Short Wave

Where did our moon come from?

Earth didn’t always have a moon. In the beginning of the solar system, when the planets were still forming, something happened that would change Earth’s night sky forever: The Moon was created! How did it happen? This episode, co-host Regina G. Barber searches for answers with planetary scientists. With co-host Emily Kwong, they discuss how the moon was likely made, how scientists know and what that might mean for where Earth’s water came from. Check out Regina's reporting on hydrothermal vents [https://www.npr.org/2024/11/04/1211597144/life-space-moon-alien-oceans-hydrothermal-vents]. Interested in more planetary science? Email us your question at shortwave@npr.org [shortwave@npr.org]. Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave [http://plus.npr.org/shortwave]. See pcm.adswizz.com [https://pcm.adswizz.com] for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. NPR Privacy Policy [https://www.npr.org/about-npr/179878450/privacy-policy]

Eating disorder recovery in a diet culture world

Eating disorders are complicated illnesses that skyrocketed among teenagers during the COVID-19 pandemic. Pediatrician Eva Trujillo [https://iaedpfoundation.com/2025-board-of-directors-announced/] says they "literally rewire the brain," decrease brain size, and make it harder to concentrate and to regulate emotions. Malnutrition can slow the metabolism, impact bone density and even lead to cardiac arrest. But Eva says, with the right treatment, people can also recover fully. She's the president of the International Association of Eating Disorder Professionals [https://iaedpfoundation.com/2025-board-of-directors-announced/] and co-founder of Comenzar de Nuevo [https://comenzardenuevo.org/tag/dra-eva-trujillo/], a leading treatment facility in Latin America. Today on the show, host Emily Kwong [https://www.npr.org/people/767284140/emily-kwong] talks about the physical and mental impacts of eating disorders with Dr. Trujillo and Moorea Friedman, a teen mental health advocate and host of the podcast Balancing Act [https://balancingact.life/]. Plus, how to recover in a world steeped in diet culture. (encore) Want us to cover more mental health topics? Tell us by emailing shortwave@npr.org! We'd love to know what you want to hear from us! Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave [http://plus.npr.org/shortwave]. See pcm.adswizz.com [https://pcm.adswizz.com] for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. NPR Privacy Policy [https://www.npr.org/about-npr/179878450/privacy-policy]

These voicemails save lives

For residents of Prek Touch, Cambodia — right on the banks of the Mekong River — flooding is a regular part of life. But as those floods worsen due to climate change, it’s getting harder to adapt. Along with other flood-prone regions throughout Southeast Asia, government officials are facing an issue: how to deliver widespread weather warnings in a timely, effective way. One solution that’s working for Prek Touch? Voicemails. Today on the show, NPR climate correspondent Rebecca Hersher [https://www.npr.org/people/384067907/rebecca-hersher] explains how a simple phone alert can prompt preparation, increase evacuation, and save lives. Interested in more stories about natural disaster preparedness? Email us your question at shortwave@npr.org [shortwave@npr.org]. Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave [http://plus.npr.org/shortwave]. See pcm.adswizz.com [https://pcm.adswizz.com] for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. NPR Privacy Policy [https://www.npr.org/about-npr/179878450/privacy-policy]

The psychology behind why you dread small talk

Do you avoid small talk in the office, or with your neighbor in the elevator? If so, you might want to give it a chance. According to a study just published in the Journal of Personality and Social Psychology [https://www.apa.org/pubs/journals/releases/psp-pspi0000521.pdf], even when participants were primed that a conversation would be boring, it turned out to be more interesting than they anticipated. Today on the show, we get into that, plus why scientists gave lobsters painkillers, and a clue about the formation of the Grand Canyon.  Interested in more science? Email us your question at shortwave@npr.org [shortwave@npr.org]. Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave [http://plus.npr.org/shortwave]. See pcm.adswizz.com [https://pcm.adswizz.com] for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. NPR Privacy Policy [https://www.npr.org/about-npr/179878450/privacy-policy]

A new approach to brain health, one neuron at a time

Neuroscientist Paul Nuyujukian [https://bil.stanford.edu/paul-nuyujukian] likens the brain to a stadium full of people. To eavesdrop on the crowd you could put a microphone in the middle of the stadium. But to understand the conversations you need to record individual people. He thinks about the brain the same way. To understand brain disease, he studies neurons—one at a time. And his insights are shedding light on a big global issue—stroke. The World Health Organization predicts one in four adults [https://www.who.int/news-room/fact-sheets/detail/stroke] will have a stroke in their lifetime. Strokes can cause death, or lead to paralysis or speech problems. But there’s still a lot researchers don’t know about how the brain recovers from an event like a stroke. Nuyujukian directs a lab at Stanford University that studies how the brain controls movement, including after neurological events like stroke. We get into how he does this, and why he hopes his research could eventually help people who’ve been paralyzed.  Email us your questions about the brain – or anything else to do with science at shortwave@npr.org [shortwave@npr.org]. We may turn it into an episode in the future! Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave [http://plus.npr.org/shortwave]. See pcm.adswizz.com [https://pcm.adswizz.com] for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. NPR Privacy Policy [https://www.npr.org/about-npr/179878450/privacy-policy]