For 160 years, scientists believed snakes evolved in the sea. Then a student on his very first fossil expedition found a 95-million-year-old skull in Patagonia, and it rewrote the story. In this video, we uncover the true origin of snakes, the misidentified bone that fooled paleontologists for generations, and what modern genomics reveals about how snakes lost their legs, built a venom system, and survived the asteroid that killed the dinosaurs.

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