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Today I learned that the 19th Amendment (Women's Suffrage) almost wasn't ratified until a Tennessee senator who was against it (Harry Burns) received a letter from his mother telling him to "be a good boy" and vote for ratification. He broke the deadlock the next day and the 19th was ratified.

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WKK4 TIL Oscar Z Acosta, better known as Hunter S Thompson’s attorney in Fear & Loathing In Las Vegas, vanished while traveling Mexico in 1974. No traces of him have ever been found.
KYLew TIL that the Tetrahymena thermophila, a single-celled ciliated unicellular eukaryote, has 7 different sexes. Any two different sexes can mate and produce offspring, and the sex of the offspring can be any of the 7 different types. This allows for 21 different mating combinations.
pO9O TIL Iceland’s population so closely knit that there is a dating app to help prevent accidental incest
GVLJ TIL that a Jewish tradition where a rabbi sucks the blood from a freshly-circumcised penis, has caused many babies to contract herpes. 2 have died and 2 have suffered brain damage since 2000.
pov8 TIL that a clock at a university in New Zealand that runs on changes in air pressure and temperature has been running nearly continuously without being wound since its construction in 1864, stopping only when it needed to be cleaned or moved.