When the world was at the center of the universe, the planets did a strange dance.At times, it seemed they moved in reverse at times, doing a weird backward loop.But this wasn't just a quirk.It wasn't a wrinkle that needed to be ironed out with a theory like "epicycles."No, this was a loose thread. And when Kepler and Copernicus pulled it, our view of the universe unraveled. Get our full sonic encyclopedia - a series of shows to supercharge your creative brain - at www.clay.inc.

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