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TIL Men who do not have chest hair are deficient in a particular androgen or male hormones

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VB0Ek TIL that a combustion engine in a car running at 4000rpm will consume ~ 0.2 liters of gasoline per minute, and a staggering 10,000 liters of air per minute.
9YrED TIL Caesar was actually pronounced “kai-sar” and is the origin of the German “Kaiser” and Russian “Czar”
NEjP TIL when Samuel Adams received a female slave as a wedding gift, he insisted that “a slave can not live in my house; if she comes she must be free.” He was able to free her after years of writing emancipation papers, and treated her as an equal family member throughout that time.
OGayY TIL that a fire destroyed most of Harvard Library’s collection in 1764. Only a small number of books were spared, including 144 that were checked out at the time. One of these books was found and returned in 1997!
awkPJ TIL as a result of World War II the population of London fell so dramatically that the city didn't return to its pre-war population level until January 2015.