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TIL that there were kamikaze torpedo/submarines called 'Kaiten' used by the Japanese at the end of WW2. They were fast, silent, made no bubbles, and contained 1.44 tons of TNT in the tip.

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VMGBB TIL Despite being an atheist, the famed mathematician Paul Erdős often referred to a celestial book "The Book" that contains every one of God’s perfect mathematical proofs. Two mathematicians then collected these proofs and published them in 1998, with new proofs being added over the last 2 decades.
oRroY TIL a man named Juhayman al-Otaibi claimed to be the Mahdi (a messianic figure in Islamic eschatolog) and formed a cult following that besieged and took over al-Haram, the holiest Islamic site, in the city of Mecca for more than two weeks, and had left 255 pilgrims killed and hundreds injured
ndpr TIL that Professor Kenneth Bentley and his entire team, who discovered Etorphine (a drug which is 1000-3000 times more potent than morphine and 4mg will immobilize a 4000kg elephant), passed out because someone stirred their morning tea with a glass stirrer used to make the etorphine.
w0DJ TIL that Moscow street dogs display specialized behaviors that differentiate them from domesticated dogs & wolves: pack leaders tend to be the most intelligent rather than the strongest, and packs tend to deploy its cuter members first, as they are more successful in begging for food from people.
W7Y5L TIL of the Lizardman's Constant, the idea that in any given poll roughly 4% of answers will be comedic or malicious and not representative of the respondent's true thoughts, such as answering "Yes" when asked if they believe Lizardmen control the world.