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TIL Enigma (German WWII encryption) was broken in part because operators used guessable passcodes, including letter repeats, adjacent key letters, four letter German names, and obscenities.

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LQyRZ TIL H.H. Holmes, a 19th-century serial killer, built the "Murder Castle" in Chicago during the 1893 World's Columbian Exposition. The hotel had soundproof rooms and hidden passages, allowing Holmes to lure and brutally murder unsuspecting guests, primarily young women.
YpZQv TIL facial hair doesn't "stop growing", but rather each follicle has a limited lifespan. People who can grow longer beards have follicles that survive for longer before falling out
pY4LN TIL captions and subtitles are not the same thing. I've used them interchangeably. Captions are a transcription of dialogue and are primarily used to help viewers who cannot hear the audio clearly. Meanwhile, subtitles provide a translation for viewers who don’t understand the language being spoken.
64oY TIL 37 years before Pearl Harbor, Japan launched a surprise attack on Russia, destroying much of the Russian fleet at Port Arthur. US officials applauded the attack for its ingenuity.
Bgx4k TIL that the world's largest uncut diamond, the "Cullinan", was found in South Africa in 1905 and weighed 3,106 carats. It was eventually cut into nine separate stones, two of which are part of the British Crown Jewels.