Short Wave

Why scientists are stoked about mysterious black hole stars

You've heard of black holes. You've heard of stars. But have you heard of the newly discovered black hole stars that may explain multiple mysteries of the universe? We just did and we're honestly freaking out about it. Learn everything you need to know about it in this episode. Plus, hear some other cool stories fresh off the presses: Which exercise can help reduce your risk of dementia and how shrews shrink — and then regrow — parts of their body throughout the year. Interested in hearing more reporting on space, scientific mysteries or other emerging science? We want to know! Email us what you'd like us to talk about at shortwave@npr.org [shortwave@npr.org]! Support public media with NPR+ and enjoy perks for over 25 podcasts like this one. This show’s perks include sponsor-free listening. Learn more at plus.npr.org [http://plus.npr.org/]. 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]

More men are taking testosterone. What gives?

If you’re a guy – or even just friends with a guy – and on the Internet, you may have noticed that testosterone discourse is everywhere. There’s Defense Secretary Pete Hegseth announcing testosterone screenings for soldiers, Joe Rogan discussing hormone therapy, and influencers discussing high- and low-T levels. Those levels affect more than just sex. They also affect metabolism, bone health, muscle mass, red blood cell production and brain function. NPR science reporter Will Stone [https://www.npr.org/people/919093243/will-stone] took a deep dive into it all: What deficiency looks like in men, what doctors recommend and what the research says about who actually needs testosterone replacement therapy. Interested in hearing more reporting on popular science topics? Email us what you’d like us to cover at shortwave@npr.org [shortwave@npr.org]. Support public media with NPR+ and enjoy perks for over 25 podcasts like this one. This show’s perks include sponsor-free listening. Learn more at plus.npr.org [http://plus.npr.org].  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 survivor's view from inside a tornado

What’s the dumbest thing Perry Samson says he’s ever done? Getting caught inside a tornado.  But when you’re an atmospheric scientist who studies supercell thunderstorms—with a special interest in the ones that cause tornadoes—that sort of thing is a bit of an occupational hazard. Lucky for Perry, he also made a split-second decision while in the tornado that may be the smartest thing he’s ever done. So today on the show: What we can learn from nature at its wildest. Interested in more science behind the weather? Email us your question at shortwave@npr.org [shortwave@npr.org]. Support public media with NPR+ and enjoy perks for over 25 podcasts like this one. This show’s perks include sponsor-free listening. Learn more at plus.npr.org [http://plus.npr.org/]. 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]

Could future wars be fought by AI?

This year, the Department of Defense announced that they’d entered agreements with eight artificial intelligence companies. It follows decades of popular media exploring the idea of artificial intelligence in war – from the computer threatening global thermonuclear conflict in the movie WarGames to the Skynet neural net in Terminator. In 2026, when Anthropic’s Claude and OpenAI’s ChatGPT are just a click away, the concept of AI-supported war is suddenly much closer to reality. So what does it really mean for militaries to use AI? And what are the potential implications if they succeed? Short Wave producer Hannah Chinn [https://www.npr.org/people/1255819925/hannah-chinn] reports. Listen to the whole Tech Camp series [https://www.npr.org/series/g-s1-133746/short-wave-tech-camp].  Interested in more military science and/or tech episodes? Email us your question at shortwave@npr.org [shortwave@npr.org]. Support public media with NPR+ and enjoy perks for over 25 podcasts like this one. This show’s perks include sponsor-free listening. Learn more at plus.npr.org [http://plus.npr.org]. 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]

Inside Colombia's big quake – and why more could be coming

The 7.4 magnitude earthquake that struck Colombia was devastating. Host Regina Barber talks to earthquake geologist Rodrigo Alejandro Leon Loya about the tectonic plates that caused the quake and what it was like 150 miles from the epicenter.  Interested in more science in the news? Email us your question at shortwave@npr.org [shortwave@npr.org].    Support public media with NPR+ and enjoy perks for over 25 podcasts like this one. This show’s perks include sponsor-free listening. Learn more at plus.npr.org [http://plus.npr.org].  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]