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TIL that the interstellar travels of Voyager I and II were only possible due to a specific planetary alignment that only occurs every 175 years. The position of the 4 outer planets enabled a slingshot move which greatly increased the crafts speed.

Read more voyager.jpl.nasa.gov

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4X0aa TIL of the Great Toyota War, which was the last phase of the Chadian–Libyan conflict in 1987, on the Libyan–Chadian border. It takes its name from the vehicles used, the Toyota Hilux and the Toyota Land Cruiser, to provide mobility for the Chadian troops as they fought against the Libyans.
8aMAZ TIL during WWI all Army recruits underwent intelligence testing, the largest mass testing that had ever been attempted before. By the end of the war, close to 2 million soldiers had been tested. As a result of the tests roughly half of the recruits were classified at or below the level of "moron"
nenVo TIL that Queen's 1985 Live Aid performance (seen at the end of the Bohemian Rhapsody movie) was voted the greatest live performance in the history of rock. Jimi Hendrix's appearance at Woodstock in August 1969 came second, followed by the Sex Pistols in 1976.
xVXP5 TIL The Patron Saint of Poland is called The Black Madonna. Her skin his discolored due to centuries of lights and candles being burnt in front of it.
awnB9 TIL that Marco Polo makes no mention of the Great Wall in any of his writings on China, which some people believe proves he never visited the country. This type of conclusion is called “argument from silence” and is a common logical fallacy.