The "discovery" of the Piltdown Man was announced on this day in 1912. There's more to the story in the December 26, 2016 episode of Stuff You Missed in History Class.
This Day in History Class
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Abraham Ortelius publishes the first world atlas - May 22nd, 1570
Leopold and Loeb murder Bobby Franks - May 21st, 1924
President Lincoln signs the Homestead Act - May 20th, 1862