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TIL that the largest cavalry charge in history happened at the Turkish seige of Vienna. Commanded and led by the King of Poland, 18,000 German and Polish horsemen charged at the Turkish line, destroying the invading Ottoman army. The battle is thought to have ended the Islamic invasion of Europe.

PY9MZ TIL that Bob Widlar (uA702 creator) installed "The Hassler" outside his office. Whenever people started talking, the device would detect the audio, convert it to high freq, and playback the converted sound. Visitors would notice this ringing, stop talking, and the sound disappeared. Lesson learned.
gng8 TIL all 100 nuclear reactors now operating in the U.S. were built on or before 1977
QJMJk TIL Calvin Klein Obsession for Men is used to lure jaguars into camera traps. The cologne contains civetone and vanilla extract, in which the civetone resembles a territorial marking and the vanilla extract sets off a curiosity response.
VnDk TIL that while serving in Cyprus, a British Army Lance Corporal named Billy Windsor head-butted another solder on parade in front of dignitaries from several nations. He was charged and demoted to Fusilier, but was later reinstated, with full mess privileges. Billy Windsor is a fucking goat.
4WKg TIL A 66-year-old hiker, who became lost on the Appalachian Trail, kept a journal documenting her 26-day ordeal before succumbing to lack of food and exposure. In one entry, she pleaded “When you find my body, please call my husband and daughter.”