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TIL that the grippy texture on metal tools is called Knurling
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Gvgg
TIL there is an episode of Supernatural in which the two main characters are sent to an alternate universe in which they play the actors that play their characters on Supernatural (themselves) who are in the middle of filming an episode of a TV show called Supernatural.
apxM
TIL that a shot in the US is 25% larger than one in Northern Ireland and almost twice as large as a shot in the rest of the UK.
jNVrn
TIL that Roger Boisjoly was an engineer working at NASA in 1986 that predicted that the O-rings on the Challenger would fail and tried to abort the mission but nobody listened to him
aw0no
TIL of the salt mine lake disaster which occured in 1980 due to a "minor miscalculation" by Texaco, which resulted in an entire lake being drained into a salt mine. The vortex even reversed the current of the gulf of mexico for 4 days
ZpJD4
TIL: in 1919, famous eugenicist Charles Davenport published a study claiming that being a sea captain (thalassophilia - "love of the sea") was a recessive sex-linked genetic trait because it appeared only in males and could skip generations. He dismissed all criticism as “uninformed.”