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TIL That the book 'Where the Wild Things Are' created controversy when it was first published because many parents and people thought that the wild things looked too scary for children

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8aAnL TIL napping after a learning session leads to significantly better recall rate of the learned material one week later
a5bA TIL British spies used semen as invisible ink during WWI and this method was invented by Sir Mansfield Cumming
Y7pgB TIL about the Baby Scoop Era, when young women were shamed into giving up illegitimate babies for adoption. I remember girls who "went away, " but didn't realize it was a historical era.
W7pr9 TIL about Josiah Harlan, an American traveler who raised an army in Afghanistan 1830s with the intent of becoming a king. He led his followers on various campaigns against slaveholding princes and after returning to the US attempted to be appointed a general in the Civil War against the Confederacy.
a8JVA TIL In WWI, the German's A7V Sturmpanzerwagen tank had a minimum of 18 crew, sometimes as many as 25 men onboard. 1 commander, 1 driver, 1 mechanic, 1 signaler, 6 machine gunners, 6 loaders, and 2 artillerymen