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TIL of Grammatical Pedantry Syndrome, a form of OCD that compels those suffering from it to constantly correct others' grammar.

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8eeeb TIL, in 1989 in Tacoma, WA, Army Ranger buddies at a bbq were threatened by Crips in the neighborhood. The Rangers called more buddies, who brought more firearms. They set up defensive positions and a shoot-out ensued later that night when the Crips made a move on the house.
WkRjN TIL: There is an image that, if stared at for 15 minutes, will "burn in" for up to three months. Researchers call it the "McCollough Effect"
4kA75 TIL the closest living land relative to the elephant is … The Rock Hyrax, a small guinea-pig like mammal
MDmB TIL that in the movie “The Program” there was a scene where football players laid in the middle of the highway to prove they have nerves of steel as vehicles avoided them. In real life this stunt was copied but vehicles ran over each person instead of avoiding them.
W7dXA TIL that Peter Benchley regret writing "JAWS". He later devoted himself to ocean conservation.