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TIL that Iron Man started filming before the script was finished. As a result, most of the dialog in the movie is improvised because the director felt that it would make the movie feel more natural

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KyGR TIL that during the Space Race, NASA turned the creation of a functional spacesuit that could withstand the harsh conditions of space into a competition. It was largely dominated by military contractors. However, Playtex, the bra maker, entered and won the competition.
W7w6L TIL: Researchers found in 2021 after an experiment with red haired mice given the MC1R gene that redheads experience pain differently having higher pain tolerances. The MC1R gene produces more pheomelanin which causes freckles, heat sensitivity, red hair, and suppresses pain receptors.
Z87gG TIL that a shot of whiskey burns going down because it makes your heat sensors more sensitive to your own body heat
DxOP TIL Martin Luther King Jr. said Homosexuality was a Problem that Required Psychiatric Attention
7rjDP TIL In the 1940s, cars were painted with a hand-spraying technique that would accumulate overspray, which would build up and be baked repeatedly in the ovens used to cure the paint on the vehicles. These paint clumps (known as Fordite) were salvaged, cut, and polished for jewelry.