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TIL 17% of Poland's population was killed during WW2

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epKN5 TIL that the phrase "you can't shout fire in a crowded theater" was invented by the prosecutor who got Eugene V. Debs sent to prison for protesting WW1.
vPXD7 TIL that there are approximately 39,000 airplanes in the world right now. There have been approximately 150,000 airplanes throughout human history.
0dbY5 TIL Prior to the 1990s, less than a third of South Africans had access to electricity.
1Djd TIL scientists believed that during the Inflationary Epoch, roughly 10^-36 seconds after the Big Bang, the universe expanded by a factor of at least 10^26 — 100,000,000,000,000,000,000,000,000, becoming the size of a grapefruit.
p8MeN TIL: Popup headlights were actually invented in the '30s. They came back in the 80's when auto manufacture needed a way to skirt minimum headlight height safety laws, and fell back out of fashion again due to modern regulations concerning headlights being on movable body work.