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TIL Contrary to popular belief, peasants in the middle ages had excellent dental health due to a low-sugar diet consisting of abrasive foods that would prevent cavities from forming.

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Lkx1v TIL: That in 2018, James Cordier from optionssellers.com lost the entire $150 million hedge fund he managed making a bad play on natural gas and crude oil. He didn't hedge properly and lost everything. He put out this apology video, offering to buy clients lunch. He forgot to take off his Rolex.
OovNg TIL the integral of the secant formula, important in cartography, has been found accidentally when a mathematician was running through numerical approximations known at the time and recognized they matched ln(|tan(phi/2 + pi/4)|). It took 28 more years for someone find a formal proof
457o TIL that declawing a cat amputates a joint and has a number of negative health and behavioral effects, yet many veterinary associations continue to support declawing
lomv7 TIL The Imperial Japanese Army during WWII invented a 'suicide weapon' for its soldiers to use against tanks. It was a stick which had an explosive at its tip and the user would have to charge towards the tank and thrust it into the armor, which would then blow up along with the user.
JYmv4 TIL that the South Korean government started massively subsidizing (1%+ of GDP) its entertainment industry in 1994 after realizing one Jurassic Park film made as much as the combined sales of 1.5 million Hyundai cars.