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TIL during the Civil War, the US government started printing bills in fractional dollars, rather than coins, due to a metal shortage. Congress passed a law forbidding living people to be on money after the bills' designer put his own face on them, rather than a US president's.

8PkK TIL that every September, Usenet would get an influx of college freshman who would have to learn Usenet netiquette; in September of 1993, AOL began to offer Usenet access to its’ many users, overwhelming Usenet’s social norms and causing an “Eternal September,” which has lasted 7,279 days
awMV0 TIL the Nintendo Switch sold 17.8 million units in its first year alone. That is more than Nintendo’s previous console, the Wii U, sold in its entire lifetime.
OokR1 TIL that Voltaire's play "La Dépositaire" is based on a true story of Ninon de L'Enclos safeguarding a fortune during the French revolution. From Chapter VII of Life Letters and Epicurian Philosophy of Ninon de L'Enclos 1903. L'Enclos left 1000 francs for the education of Voltaire in her will!
4kK45 TIL We Might Have a Negative Leap Second. If UTC−UT1 (Figure 4) continues downward past −0.5 then we might need to have a minute with only 59 seconds for the first time ever. "We are almost as likely as not to experience a negative leap second in the next 12 years."
DQQ7J TIL that Daniel Daly received his first Medal of Honor for single-handedly killing over 200 enemy soldiers through the night in 1900