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TIL of Guevedoces, people who exist only in a small community in the Dominican Republic. They are boys who are born without male sex organs, looking mostly identical to girls until puberty when their male sex organs grow in.

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4XP0X TIL that mosquitoes perform musical duets before mating.Male mosquitos "buzz" at between 550-650 Hertz while females buzz at about 350-450 Hz. When female mosquitos fly close to male mosquitos, they harmonize their wing flapping as a signifier of good health and fitness.If they can't,no copulation.
ZpjDY TIL that upon its 1977 release, Star Wars won six Oscars, three Grammys, and two BAFTA awards, and that Time magazine also named it the "Movie of the Year"
OoJ96 TIL in 1961 Ronald Reagan released a spoken-word album warning against socialized medicine.
vPZbL TIL there's an Underground river beneath the Amazon River, it was discovered in 2011 and its about as long as the Amazon river, but it is much broader. It's unofficial name is the Rio Hamza
7WPO TIL That American Express never sends out emails without their card members name in it, whereas fraudsters say “Dear Cardmember” etc.