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TIL when we set one specific goal, people will tend to optimize for that objective regardless of the consequences. This is also known as Goodhart’s Law which says, “When a measure becomes a target, it ceases to be a good measure.”

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xV0KD TIL the first ever strike in written records was amongst the workers by the Valley of The Kings in Egypt, around 1170 B.C
8eeoL TIL of Vancouver's "Dude Chilling" Park, a local name based on the sculpture "Reclining Figure" (which looks like a dude chilling). An artist erected a fake Parks Dept. sign reading "Dude Chilling Park", but the city took it down. After public outcry, it was replaced and got official approval.
kOM0m TIL the Rubik's Cube was so popular in the 80's that the best selling book in 1981 was about solving techniques, selling over 6 million copies
A9Q7 TIL there are fish that when eaten produce hallucinogenic effects similar to LSD
pnvN TIL that Mr. Roger’s never served in the military, despite ongoing rumors that he was a Navy Seal who had 25 confirmed kills during the Vietnam War.