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TIL That Captain Underpants has twice topped the list of banned books in America

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b6rjZ TIL it seems that the Pythagorean theorem was already known before Pythagoras lived. In fact, it's used in a proof on a Babylonian clay tablet that's about 1,200 years older than Pythagoras.
D7ZY TIL The Giant Redwood Tree is so tall that in order to get water near the top of the tree, it uses “air roots” to collect water out of the fog.
0wY7p TIL that Häagen-Dazs is an American company, started by two Jewish brothers in the Bronx. “Häagen Dazs” are nonsensical words invented to sound Danish because the brothers wanted to pay tribute to the Danish treatment of Jews in WWII.
Oa11 TIL that a South Korean searched the entire USA for an American soldier to repay for the kindness shown during the Korean War.
oRmn7 TIL that the very first "crowd wave" at a sports event ocurred spontaneously. At a Colorado Rockies NHL ice hockey game in 1980, a section of the crowd rose to their feet slightly later than the section beside them. This continued around the area to complete a "wave", without having been prompted.