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TIL a 1970s Canadian science experiment made drugs freely available to both caged rats and colony rats: The rats in cages developed drug habits. The rats in normal ‘society’ refused them.

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1abg4 TIL Dogs suffer from almost every psychiatric disorder that afflicts humans, except one - schizophrenia.
N7rA1 TIL that the fictional town of Bikini Bottom from the show SpongeBob Square Pants is shown in the series to be underneath a real place called Bikini Atoll; a former nuclear test site that is still uninhabitable today.
N5KQ TIL that Norse people already saw the world as round before it was proven to be so
OoJW1 TIL MMA fighter Rory MacDonald would come out to music like M.C. Hammer's "U Can't Touch This", "300 Violin Orchestra" and Nickleback because the music guy was texting Rory's old phone number for his walkout music and a fan was responding
E1AW0 TIL after finishing the 2012 Olympics as the most successful swimmer of the meet for the third Olympics in a row, Michael Phelps contemplated suicide