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Radiolab

The Glow Below

October 31, 2025·29m

A call to oceanographer Edie Widder about a fish with a very odd immune system quickly becomes something else: a dive into the deep sea, into a world of brilliant light. But down there, the light doesn’t behave like light -- it sparkles and glows, but also drips, squirts, and dribbles. Today, find out how creatures make the light and how they use it, from hunting and hiding to maybe even … talking. And hear about a series of mysterious moments where Edie goes from studying the creatures to becoming one of them. EPISODE CREDITS: Hosted by - Molly Webster Reported by - Molly Webster Produced by - Maria Paz Gutierrez with help from - Molly Webster Fact-checking by - Diane A.