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TIL of Seki Takakazu, a mathematician described as "Japan's Newton", who independently discovered many results attributed to his European contemporaries, some of which were rediscovered only centuries later.

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74oX TIL to get revenge on fellow Boy Scouts who bullied him, a Tokyo resident mailed more than 500 boxes of soggy, smelly garbage including old underwear and rotten tea leaves to his tormentors, writing a random destination as the address with the bully’s return address in order to escape detection.
wL4G7 TIL A 2014 U.S. study showed one hour of sleep during the daylight saving time raised the risk of having a heart attack the next week by 24%. By contrast, when “falling back,” the extra hour of sleep made heart attacks risk fall 21% the next week.
wLkPW TIL about sentences that people don't at first realize make no sense ("Escher sentences"): "More people have been to Russia than I have"
7rVOr TIL Mr. Miyagi was a Congressional Medal of Honor recipient. He was part of the 442nd Regimental Combat Team historically one of the most highly decorated regiments in WW2. There is a scene where Daniel picks it up out of a box after he puts a drunk Mr. Miyagi to bed.
kOwl1 TIL The United States Marine Corps emblem has a globe showing the western hemisphere, while the Royal Marines emblem has a globe showing (most of) the eastern hemisphere. Between the two, they cover the whole globe.