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50

TIL: St. Louis was the 4th largest city in 1910 (8th largest as recently as 1950, and now 70th), Buffalo was the 10th largest (now 78th). Cleveland was the 6th largest in 1940 (now 54th), Detroit was the 4th largest (7th largest as recently as 1990, and now 27th).

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OoKwX TIL The day Malcolm X was assassinated at the Audubon Ballroom, a dance was previously scheduled for 7p. The dance was allowed to happen as scheduled with the bullets still in the wall, completely compromising the crime scene.
v1PwD TIL: The Soviet Union built the first supersonic airliner (before the Concorde) and it was a disastrous failure
Yddr TIL - There is no evidence that Betsy Ross designed the first America Flag. It is very likely that her descendants made up the story in order to get her into the history books.
o8Xo TIL over half of America’s Fortune 500 companies started during a depression or recession.
D1edv TIL: In 1883, a volcano on Krakatoa erupted so violently, the eardrums of sailors ruptured over 40 miles away; island of Rodrigues 3000 miles away heard noises; and was heard by over 50 geographical locations covering a thirteeth of the globe.