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TIL In the 1980s Ronald Graham offered a $100 prize for the solution to the Boolean Pythagorean triples problem. The $100 was awarded to Marijn Heule in 2018.

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m5Vp TIL that wheelchair athletes with spinal injuries will sometimes intentionally injure themselves on the lower body (e.g. break a toe), causing their bodies to respond by raising blood pressure and enhaincing their performance. This practice has been banned as cheating.
QbVp TIL In 1996, a painting was stolen from the Museum of Bad Art. The museum offered a reward of six dollars and fifty cents for its return, and the purported thief demanded a $5,000 ransom ten years later. It was returned with no ransom paid.
6rMZ TIL it’s a faux pas in Russia to give your date a dozen flowers; You give an odd number of flowers for a happy occasion, and an even number for condolences.
neWgY TIL that early humans hunted animals by chasing them to exhaustion. "Persistence hunting" takes advantage of humans' two legs and ability to sweat, which makes us stronger distance runners than prey.
v1Y84 TIL Mythbusters hosts Adam and Jamie built a combat robot for the show Robot Wars. It was so effective that it often sent pieces of its opponent's bodywork over the shield walls of the arena into the crowd, and after two fights the show's insurance company deemed the bot "too hazardous" to compete.