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TIL the first non-stop transatlantic flight happened in 1919. A modified WWI bomber with an open cockpit took off from Newfoundland, Canada with a crew of two. They almost spiraled into the ocean twice in heavy fog, had to climb onto the wings to clear ice, and landed in a bog in Connemara, Ireland.

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R7Lg9 TIL about Movile Cave, a cave that was cut off from the outside world for ~5.5 million years. There are sulfuric vents in the cave and all organisms within rely on chemosynthetic bacteria that use sulfur as an energy source. >50 species live there, 35 of which are endemic(they only exist there).
b6kdN TIL that the US government stores 1.4 billion pounds of cheese in underground caves in Missouri
xR8w TIL that WWII inspired Karl Popper’s Paradox of Tolerance, which states that if a society is tolerant without limit, their ability to be tolerant will eventually be seized or destroyed by the intolerant.
ANZew TIL pollen research from the Sea of Galilee and Dead Sea show a devastating drought from 1250 to 1100 BCE caused the collapse of civilization in the Late Bronze Age.
YYwP TIL there have been over 2,000 nuclear bombs dropped on the world since 1945.