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TIL early 20th century pregnancy tests involved a lengthy and costly process where the urine sample would be injected into five mice per woman. The mice would then be dissected to find out if they were ovulating. These results would be obtained in a week.

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1dV TIL that Louis Armstrong suffered from severe calluses on his lips due to his excessive trumpet-playing. So, he cut them off with a razor blade.
rbKx TIL in a poll of 813 UK shoppers, 95% said their top reason for buying organic food was to avoid pesticides, despite the fact that organic farmers can and do indeed utilize pesticides and fungicides to protect their crops.
VNZ TIL Jimmy Carter saved beer by deregulating the entire beer industry
6E1lJ TIL that Simon Tatham, creator of the popular terminal emulator PuTTY, suffers from a condition known as anosmia, meaning he does not have a sense of smell.
9xor TIL During the Cold War, the USSR thought the heavily trafficked building in the center courtyard of the Pentagon was a top-secret meeting room and pointed nukes at it. It was a hot dog stand.