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TIL in 1974 the CIA mounted a top-secret research project, "Azorian", to recover a Soviet nuclear missile submarine that had sunk in 1968 using a grapple secretly lowered from underwater, ultimately recovering about a 3rd of the submarine and two nuclear missiles from a depth of over three miles.

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kMag TIL Quarter-life crisis! a period of life ranging from twenties to thirties, in which a person begins to feel doubtful about their own lives, brought on by the stress of becoming an adult.
8ap18 TIL that in WW2 a polish doctor helped 8000 jews by creating a fake typhus epidemic. Not risking an epidemic, the Germans quarantined the area instead of sending them to concentration camps.
yw5J TIL Ophiocordyceps unilateralis has been known to destroy entire ant colonies. In response, ants have evolved the ability to sense that a member of the colony is infected; healthy ants will carry the dying one far away from the colony in order to avoid fungal spore exposure.
EZeX TIL that in Oregon, a citizen may issue a traffic ticket to a Law Enforcement Officer under ORS 153.058
kwkd TIL that Texas has its own independent electrical grid disconnected from the rest of the US because Texas.