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170

TIL cats have a varying number of nipples.

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PKJO TIL for two full months, Michael J Fox worked 16.5-hour days to fulfil his commitments to both Family Ties and Back to the Future. He’d finish on BTTF at 2.30am and start again on FT at 10am
89dX TIL Michelangelo’s sculpture of Mary carrying Jesus after the crucifixion was severely damaged by insane geologist, Laszlo Toth, who attacked it with a hammer, screaming “I AM JESUS CHRIST”. Meanwhile, onlookers took many of the pieces of marble that flew off.
5Mln TIL of the Rosenhan experiment: Sane people faked hearing voices to see if they would be accurately diagnosed. They weren’t. None of the subjects were identified as impostors by the hospital staff, though psychiatric patients seemed to be able to correctly identify them as impostors.
kO0xg TIL Goodhart's Law, the principle that when a measure becomes a target, it ceases to be a good measure. For example, when a government tries to bring down unemployment figures to demonstrate how well the economy is doing, unemployment figures stop being a good measure of the economy.
e04Z5 TIL of “The Petition of the Sharks of Africa.” An 18th Century satirical letter written to the British Parliament asking them NOT to abolish slave trading. The “sharks” were angry that slave ships would no longer sink and asked for mercy so loyal shark subjects wouldn’t starve.