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TIL Petrichor is the name given to that earthy smell that accompanies rainfall.

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M5gK TIL that Bill Cosby is on the US Library of Congress “Living Legends” registry, for those who “have provide(d) examples of personal excellence that have benefited others and enriched the nation in a variety of ways”
wLan1 TIL: Norwegians pay half tax in November, so everyone has more money for Christmas.
nWvb7 TIL of the MARAUDER program, an experimental plasma railgun system that shot lightning balls with "devastating thermal and mechanical shock." It was also said to emit a strong EMP to scramble electronics. It became classified in 1993, with few references to it since.
j6K1R TIL Operation Midnight Climax was a program by the CIA in the mid 50s that used prostitutes to lure unsuspecting men to apartments in New York and San Francisco to drug them with LSD to test whether the combination of sex and LSD might influence the men to reveal information the government wanted.
7rb7x TIL of Primate Cities, which are cities that are dominant in their country/subdivision in such a way that it is the centre of said country/subdivision (e.g. New York City in the state of New York)