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TIL "Lift Every Voice and Sing" (or "Black National Anthem") was publicly performed first as a poem as part of a celebration of Abraham Lincoln's birthday by John Rosamond Johnson.

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7r78O TIL a fighter jet landed itself, undamaged, in a field in Montana after the pilot ejected when the plane went into a flat spin during training. The plane righted itself and flew away on its own. A farmer found the plane sitting perfectly in a field hours later with the engines still running.
awyvy TIL San Francisco had a plague outbreak in the 1900s. Government officials repeatedly denied that it existed to ensure that no quarantine was put into place. When they acknowledged it existed, they blamed it on China. This resulted in the destruction of Chinatown.
pYEvG TIL elevated blood pressure reduces the perception of physical pain and social pain
jWp TIL that 1991 to 2000, about 90% of the world’s LSD was made by one man.
N7a0e TIL that the Tongue-eating Louse that crawls into a fish's gills and essentially eats their tongue to live there for the rest of their lives. The fish just uses the isopod as its own tongue.