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TIL about Kaktovik numerals, a base-20 number system based on a on Inupiaq language, and created by a class of middle students

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via reddit.com

v1xm4 TIL why the cut apple turns brown. It turns out that the enzymes and polyphenols in the apple react with oxygen; now some apples on the market will not change color because they have been genetically modified.
8aLEb TIL that the patent for insulin was sold by the co-founders to the University of Toronto for $1 each. Their intention was that such an important medication should be affordable to all who need it. In the USA in 2016, patients were paying on average $450 per month for their prescriptions of insulin.
jNGLQ TIL of the tallest solider of all time, Väinö Myllyrinne. While he served for the Viipuri Heavy Artillery he was (7ft 3in) tall. Later in his life he had anothe growth spurt and he ended up being (8ft 3in) tall. On top of all that he was a wrestler, in a circus, and had GIANT hands.
7rJLO TIL that two of the oldest amusement parks in the world that can still be visited today are in Denmark. Bakken in 1583, and Tivoli Gardens in 1843. Notable visitors to these parks that took inspiration from them include H.C. Andersen and Walt Disney.
JoG4 TIL that after Drew Barrymore posed nude in Playboy at age 19, her godfather, Steven Spielberg, sent her a quilt for her 20th birthday with a note that said “cover yourself up”. Enclosed were also the Playboy pictures, altered by his art department to make her appear fully clothed.