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TIL that the Sahara Desert Ant is able to form a direct route back to its nest after foraging by adding and subtracting the vectors of its path in its head, thereby creating a short and distinct return path.

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Md6m TIl that the Greek mathematician Hippasus discovered irrational numbers. According to one version, he told his shipmates (Pythagoreans) who then threw him overboard and he drowned.
kkR5 TIL that after being rejected by 20 publishers, Frank Herbert’s 1965 sci-fi classic Dune was finally picked up by Chilton Books. The publisher was previously known only for those big car repair manuals sold in auto parts stores.
DQNej TIL contrary to popular belief Romans didn't forfeit Germania after the battle of Teutoburg forest, they sent 8 legions to recover their eagles and punish the Germans, after committing a minor genocide the legions were re-called over political concerns about the growing popularity of their general.
e0pkk TIL of the Amritsar massacre in India. In April 1919, when Indians, the majority Sikh, gathered to protest in a walled garden against British Colonial rule, British troops opened fire on the peaceful protestors, killing anywhere from 379-1000 and injuring another 1,100.
XEbaP TIL Ken Eto (衛藤 健 Etō Ken; October 19, 1919 – January 23, 2004), also known as Tokyo Joe, was a Japanese-American mobster with the Chicago Outfit and eventually an FBI informant. He survived a botched assassination, where he was shot three times in the head.