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TIL it is likely that dog’s smile because they have observed humans doing it, and we condition them to smile by giving them treats and snuggles when they look happy. They’re basically brown-nosing us.

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aowA TIL the US military once tried to build a radar detector-detector-detector detector in order to detect radar detector-detector-detectors, whose main purpose is to detect a radar detector detector, which were built to alert police to someone using an illegal radar detector
KO5OB TIL President Truman was opposed to McCarthyism, which was a means of deplatforming suspected communists without technically violating the first amendment, largely by barring them from employment. "In a free country, we punish men for the crimes they commit, but never for the opinions they have."
Oo9a6 TIL about Chai Ling, a student leader during the 1989 Tiananmen Massacre. She advocated to continue protesting until a bloodshed would change China, but when interviewed before the incident about whether she herself would attend the protests, she answered no, cause she wanted to live.
VBQEQ TIL that the first major German plot to overthrow Hitler, involving multiple generals and a Secretary of State, was cancelled last minute in 1938 when the Allies allowed the invasion of Czechoslovakia
5Y4y8 TIL The main shareholder in the firm that owns the Carrara quarries in Italy is the bin Laden family, which means the marble used in the Freedom Tower is quarried by the family of Osama bin-Laden, who engineered the destruction of the Twin Towers that previously stood on the same site on 9/11.