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TIL that the scent of a woman crying triggers a dramatic decrease in levels of testosterone and sexual arousal in the majority of men. And that men are subconsciously able to differentiate between genuine tears, and those that are forced.

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j59R TIL in the 70s the US tapped an underwater comm line located between two USSR harbors using navy divers deployed from a submarine. Submarines returned with divers every month to retrieve the tapes, and The soviets never found out despite having a network of sonar sensors!
GY7GG TIL, that in 1917, British forces were not ready for a head on assault of Jerusalem, so British intelligence created a plan where cigarettes would be air dropped by recon planes for the Ottomans everyday up until the day of the assault, where they instead dosed all the cigarettes with opium.
rR840 TIL "Seven Great Singing Stars" dominated the Chinese pop music industry in the 1930s and 1940s, which was centered in Shanghai. After 1949, the Communist Party of China denounced Shanghai popular music as Yellow Music, a form of pornography
ANbZg TIL of William IX, Duke of Aquitaine, who was also an early troubadour and kept a portrait of his mistress on his shield. The affair was the cause of his second excommunication.
DjMP TIL that Central Park in New York was once home to a thriving free black community called Seneca Village.