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TIL that two pieces of the same type of metal in space can fuse together seamlessly if they come into contact with each other. Since there is literally nothing between them, the pieces don't "know" that they're separate. This is called Cold Welding.

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8eRQb TIL there are some reports of men experiencing flu-like symptoms post orgasm. This study published in 2016 analyzes the occurrence and cause of Post Orgasmic Illness Sydrome
NZZQ TIL during the Iraq-Iran War, the United States shot down an Iranian civilian plane, killing 260 people. The US claimed it was outside civilian airspace and didn’t respond to radio calls. Both claims have been found untrue, but the US has yet to apologize.
xROg TIL that 20/20 vision isn’t actually “perfect”, and that professional baseball players average around 20/12 vision; greater acuity than conventional eye charts test for.
mx0ex TIL in 1952, at the age of 18, Donnie Dunagan became the Marine's youngest-ever drill instructor. He served 3 tours in Vietnam and was wounded several times, earning 3 purple hearts. He also kept a secret for over 50 years that he was a child actor and the voice of young Bambi.
9YeMM TIL in 1896, a bubоnіc plаgue epіdеmic struck Bombay, and the government asked Waldemar Haffkine, developer of the first chоlera vаccіne, to help. After 3 months of persistent work (1 assistant had a nervous breakdown and 2 others quit), a vаccіne was ready, with Haffkine tеsting it on himself first