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TIL that Euler, one of the greatest mathematicians to ever live and certainly the most prolific, completed about half of his life’s work completely blind

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grnOL TIL 5% of Americans have Gilbert's syndrome, which affects the liver's ability to process bilirubin. People with GS are less likely to develop heart disease due to the antioxidant nature of bilirubin.
R7OQ6 TIL a Hungarian team mounted mig fighter jet engines on a Russian T-34 tank and used the beast to snuff out oil fires like a candle
DQBNp Today I learned about the invention of the telegraph and how it revolutionized long-distance communication in the 19th century.
v1Pxx TIL: Chinese philanthropist, Run Run Shaw (1907-2014) gave $1+/- billion to fund education, aiding over 6000 construction projects. Because so many buildings (5000+) bear his name, Yifu, it is often confused as a generic name.
xAEb TIL in medieval times the Japanese used to dye their teeth black. It also acts as a dental sealant to prevent tooth decay. The reason for this was objects that were pitch black, such as glaze-like lacquer, were seen as beautiful.