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Fetuses leave cells behind in their parents' bodies, where they braid themselves into tissues, and remain, for years. What are they doing in there? Guests: Amy Boddy, Associate Professor of Anthropology at the University of California, Santa Barbara; Lee Nelson, Professor Emeritus at the Fred Hutch Cancer Center For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes) by becoming a Vox Member today: vox.com/members Thank you! Learn more about your ad choices. Visit podcastchoices.com/adchoices

Paul Ehrlich was famous for predicting a population explosion that would destroy the planet, but he didn't count on human ingenuity. Guest: Bryan Walsh, Vox senior editorial director This episode was made in partnership with Vox’s Future Perfect team. For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes) by becoming a Vox Member today: vox.com/members Thank you! Learn more about your ad choices. Visit podcastchoices.com/adchoices

What would life look like after a global nuclear war? Would underground bunkers work? What would we do for food? What about radioactive snow?! In this episode of Are We Doomed?, reporter Ben Bradford tries to find out. Guest: Ben Bradford, host of Are We Doomed? For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes) by becoming a Vox Member today: vox.com/members Thank you! Learn more about your ad choices. Visit podcastchoices.com/adchoices

What happens when researchers reexamine some of the basic facts about the Black Death? They start rewriting history and rethinking blame. Guests: Hannah Barker, professor at Arizona State University; Ulf Büntgen, professor at the University of Cambridge; Martin Bauch, historian at the Leibniz Institute for the History and Culture of Eastern Europe For show transcripts, go to vox.com/unxtranscriptsFor more, go to vox.com/unexplainableAnd please email us! unexplainable@vox.comWe read every email.Support Unexplainable (and get ad-free episodes) by becoming a Vox Member today: vox.com/membersThank you! Learn more about your ad choices

One of the world’s most biodiverse aquifers is full of strange, blind creatures that have evolved in isolation for millions of years. But one is missing. (Originally aired in 2022) Guests: Benji Jones, Vox senior correspondent; Andy Gluesenkamp, Conservation biologist and herpetologist (a reptiles and amphibians guy) For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes) by becoming a Vox Member today: vox.com/members Thank you! Learn more about your ad choices. Visit podcastchoices.

Pioneering musicians Beatie Wolfe and Brian Eno released their latest album Liminal by broadcasting it from a 50-foot microwave antenna. Noam talks to Beatie about why “dark matter music” was the perfect sound to beam into deep space, and how music can take us places that are even harder to reach. Guest: Beatie Wolfe, composer and conceptual artist For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes) by becoming a Vox Member today: vox.com/members Thank you! Learn more about your ad cho

Today on the show: a double feature — two mysteries in one episode. First, it seems like all living things emit a faint glow that disappears when they die. Then, is the International Space Station ... too clean? Guests: Daniel Oblak, professor of physics at the University of Calgary; Rodolfo Antonio Salido Benítez, scientist at SPT Labtech Links: Daniel's paper with mouse and leaf images; Rodolfo's paper on the ISS For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes...

To hear some people tell it — especially people on TikTok — inflammation is the root of all disease. It's... not that simple. But inflammation does have a lot to teach us about why modern life can make us feel so bad, and even what we might be able to do about it. Guest: Dylan Scott, senior correspondent at Vox For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes) by becoming a Vox Member today: vox.com/members Thank you! Learn more about your ad choices. Visit po

A few months ago, we put out an episode about what silence sounds like, and it caught the attention of Rob Rosenthal, who hosts a podcast called Sound School about the craft of audio storytelling. So he called up host Noam Hassenfeld to ask him a question he couldn't stop thinking about: How do you make something that sounds like nothing?Host: Rob Rosenthal, host of Sound School PodcastGuest: Noam Hassenfeld For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes...

Can microbes travel through space on meteorites? It’s an idea called “lithopanspermia,” and to work out if it’s even feasible, some researchers decided to shoot microbes — with a gun. Guests: K.T. Ramesh, professor of science and engineering at Johns Hopkins University; Lily Zhao, mechanical engineer at Johns Hopkins University For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable (and get ad-free episodes) by becoming a Vox Member today: vox.com/members Thank you! Learn more about your ad choices. Visit podcastchoices.com/adch

For the first time in over 50 years, humans have gone to the moon and back. And this time, NASA says we're going to stay. NASA's planning for more missions, a permanent moon base, and even a mission to Mars. But there's a pretty big question hanging over all these dreams: Can humans survive in space long enough to make them happen?(A version of this episode originally aired in 2022, with the launch of Artemis I.) Guests: Anne McClain, NASA Astronaut; Scott Kelly, former NASA Astronaut; Rebecca Boyle, science writer, Jonathan Jiang, NASA astrophysicist <...

Typically, the burden of birth control falls on whoever has a uterus, but it seems like that might change — and soon! Guest: Annalisa Merelli, contributing writer at STAT. For more, go to http://vox.com/unexplainable It’s a great place to sign up for our newsletter, view show transcripts, and read more about the topics on our show. Also, email us! unexplainable@vox.com We read every email. Support Unexplainable by making a financial contribution to Vox! bit.ly/givepodcasts Learn more abo...