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TIL the inventor of PGP (Pretty Good Privacy) was arrested in the US for violation of arms-export laws. His crime: he came up with good cryptography for communications and made it available worldwide, which was considered aiding the enemy with munition.

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9Y97m TIL that a 10x10 perfect “word square” has yet to be found, but has also not been disproven.
78DDX TIL the Permian–Triassic extinction event that occurred approximately 251.9 million years ago is considered Earth's most severe known extinction event. 57% of biological families, 83% of genera, 81% of marine species and 70% of terrestrial vertebrate species became extinct.
BgGxr TIL a study on professional slap fighting analyzed 333 slaps for visible signs of concussion & found that more than 50% of the slap sequences resulted in fighters showing visible signs of concussion, with nearly 80% of the fighters demonstrating at least 1 sign of concussion during their matches.
P187L TIL when the Velvet Underground released their 1967 debut album, it was a flop. Due to it’s content, it was banned from many record stores, and radio stations refused to play it. Magazines also refused to carry ads for the album. Nowadays, it’s regarded as one of the greatest debut albums ever made.
ADQJa TIL in 1999 a study showed that a supermarket sold more French wine when stereotypically French music was played instore. This also worked with German wine/music. Customers later claimed that they were ‘unaware’ of the music’s influence.