Daniel Martinez discovered the unthinkable: a creature that breaks one of the most fundamental laws of life. In the wake of his discovery--which has been widely confirmed by the scientific community--all kinds of people have thrown themselves into trying to unlock the secrets of how this creature seems to cheat death. Cellular biologists, aging researchers, and the biotech industry all hold high hopes that there may be some application to slow human aging. Millions of dollars are being poured into the dream of extending the human lifespan, which looks increasingly possible. But Daniel? He trashed his experiment. He completely abandoned the pursuit of unlocking the secrets of immortality. Perhaps because he believes that dream is all wrong. Invisibilia co-founder Lulu Miller went down to visit him in California to try to find out why. Please take our short, anonymous listener survey: npr.org/invisibiliasurvey. | To learn more about this episode, subscribe to our newsletter. Click here to learn more about NPR sponsors.

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Bernie Krause was a successful musician as a young man, playing with rock stars like Jim Morrison and George Harrison in the 1960s and '70s. But then one day, Bernie heard a sound unlike anything he'd ever encountered and it completely overtook his life. He quit the music business to pursue it and has spent the last 50 years following it all over the earth. And what he's heard raises this question: what can we learn about ourselves and the world around us if we quiet down and listen? | To learn more about this episode, subscribe to our newsletter. Click here to learn more about NPR sponsors.

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You hear the train barreling towards you and you're tied to the tracks. It's an impossible situation. Most people would panic, and then a tiny handful would think up improbable workarounds. This season on Invisibilia: inventors in desperate times.

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Alix presents one of our favorite episodes from our friends at NPR's history podcast "Throughline." For centuries, the United States has been a prime destination for migrants hoping for better economic opportunities, fleeing danger in their home countries or just seeking a new life. But has there ever been a moment when Americans were the ones who felt compelled to flee elsewhere? In this episode, two stories that challenge the idea of who and why Americans sought refuge in other countries.

What happens when you treat artificial intelligence with unconditional love?

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Producer B.A. Parker started recording her calls with her father because she was concerned about the care at his nursing home. But the recordings gave her a window into something very different: their relationship. So she started recording her calls with her grandmother as well. A story of relationships told through the small recorded calls between people who love each other.

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As a parent, what do you do when your four-year-old starts telling you about memories that can't possibly be his? Memories that he says are from a past life?

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Alix presents a new episode from NPR's Rough Translation about residents of an immigrant neighborhood in Marseille, France who considered their local McDonalds to be a home of sorts, so when the owner tries to sell it, they take extreme measures to try and save it.

A mysterious profile pops up on a dating app - leading to a bubble of chaos and confusion. A story about trying to sort fact versus fiction, how destabilizing that can be, and a very strange confrontation with the truth. NOTE: Since this story was originally published, we have added some background reporting and context to the episode.

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Richard Kraft was in a fog of grief when he bought his first Disney collectible at an auction. But once he started, he couldn't stop. In the first episode of our new fall season, we explore the role of positive distraction in the face of adversity.

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