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TIL of the submarine USS Tang. It was hit when it's own torpedo boomeranged. 89 crew with 29 trapped. 13 made it out through a hatch but only 9 made to the surface where they were picked up by the Japanese and taken to a POW camp. They survived the war.

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kOpVe TIL that for decades the US Navy Freedom of Navigation program has kept the global shipping lanes free and open for commerce and trade, even for US enemies like Russia and China. The FON program acts as a deterrent against regional conflict, arbitrary maritime claims and piracy.
OjAR TIL Sunscreen is contributing to decline of coral reefs. The damaging effects were seen in coral in concentrations of oxybenzone as low as 62 parts per trillion, which is equivalent to a drop of water in six and a half Olympic-sized swimming pools, according to the researchers.
grP1D TIL the Apple II version of the video game Karateka had an Easter egg whereby entering the floppy disk the wrong way up displayed a full version of the game completely upside-down.
Z88NB TIL NRA Board Member Ted Nugent sang a song about how he likes to have sex with 13 year old girls. He's never apologized for the song and is still a board member.
E1pA0 TIL of chromesthesia, a type of synesthesia in which individuals perceive colour in addition to normal auditory sensations. Associations are idiosyncratic but consistent over time, studies found. Bernstein and Liszt are associated with the condition; the latter asking his orchestra to play 'bluer'.