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TIL that during WW2 a “Bat Bomb” was created. As the bomb descended the bats would warm up and awaken from hibernation. At 1,000 ft. altitude, the bomb would open and 1000+ bats, each carrying a tiny time-delayed napalm incendiary device would emerge.

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KOpBG TIL that 18th century France developed a visual telegraph system. Using a series of towers topped with adjustable beams that would display a message and instructions on the next tower to relay it to, messages could be sent across the country in a mere matter of hours, long before electricity.
mxW9R TIL minarets (the towers of mosques) are banned in Switzerland
Knma TIL North Korea once shot down an American spy plane—killing 31 soldiers—and the USA didn’t retaliate
NXpRN TIL Washington’s dentures were made of a mix of human and animal teeth
x6NJB TIL Johann Bücheler built Switzerland's first guillotine in 1836 after another carpenter became depressed. He earned 160 francs but became an outcast. To earn some money he build a bonsai guillotine and beheaded celery.