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TIL that cross writing was a popular technique used in the 1800s in order to conserve paper, as the resource had become scarce.

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5Gg9 TIL Helium is a non-renewable resource, the US used to stockpile it, and we may run out eventually
XR66 TIL penguins have an specialized organ that filters salt from their bloodstream, allowing them to drink salt water
nXAd TIL That the world of Ooo, the setting of Adventure Time, is a post apocalyptic Earth that came to be after a great “mushroom” war. Hence why so many random, destroyed scraps of technology can be found around the land, and most creatures have odd mutations, with Fin being the last human.
KlVQ TIL Masturbation relieve depression and lead to a higher sense of self-esteem
pXOG TIL actor Gary Busey had been an outspoken opponent of helmet laws before his own motorcycle accident, but than changed sides and said: “If you don’t wear a helmet, you’re not playing with a full deck.”