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TIL Kansas serial killer, the BTK Killer, installed alarms as a part of his job, and many of his clients had booked the company to stop BTK from ever entering their homes, unaware that BTK himself was installing them.

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KynE TIL NASA used 3D printing to make rocket engine injector, cutting manufacturing time from 1 year to 4 months and cuts costs by 70%.
oBoMW TIL in 2012 authorities discovered over 1,500 pieces of stolen art valued at 1.3 billion in the Munich apartment of Cornelius Gurlitt. Cornelius never held a job and lived alone surrounded by the art for 40 years. These pieces were to be part of Hitler's Fuhrermuseum.
O6xX TIL In the USA Ice Cream has to have milkfat. So Vegan Ice Cream cannot be called Ice Cream
QJBdX TIL that the shape of the human penis has evolved to remove another man's semen from a women's vagina
nWNvY TIL Madagascar had pygmy hippopotamuses that went extinct likely within the last thousand yeas. They may have survived as late as a 1976.