Most people think of yo-yos as a fun, old-school toy for kids: a pretty simple, clever device leveraging physics with a string and a weight. Yet as Ben, Noel and Max discover in today's episode, the story of the humble dates back into antiquity -- and the story of its evolution is riddled with ridiculous ups and downs.

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CLASSIC: That Time Ohio and Michigan Almost Went To War
34:36

The Ridiculously Inspiring Story of Free Public Restrooms, Part Two: The Rise of CEPTIA
33:15