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TIL That going postal is an American English slang phrase referring to becoming extremely and uncontrollably angry, often to the point of violence, and usually in a workplace environment. The expression derives from a series of incidents from 1986 with the United States Postal Service (USPS).

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4XmPJ TIL that Maria Theresa of Austria had her children inoculated against smallpox after the epidemic of 1767. This changed the negative perception of inoculation among Austrian physicians. Maria Theresa also held a dinner in her palace for the first 65 children who had been inoculated in Austria.
LQkjQ TIL there are four countries in the world which are yet to adopt the Gregorian calendar: Ethiopia, Nepal, Afghanistan, and Iran.
xoww TIL the “X” in “Xmas” isn’t a way to avoid mentioning Christ. “X” represents Chi (χ), the first Greek letter of Χριστός (“Christ”). “Christ” has been abbreviated “X” in English for centuries, as it was in Greek.
PY7L TIL that Will Smith was originally offered the part of Neo in The Matrix but turned it down so he could be in a movie called “The Wild West”.
411X TIL of two twins separated at birth. Both were named James by their families, married and divorced women named Linda, remarried to women named Betty, had sons named James Allan and James Alan, and dogs named Toy.