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TIL a "bottle episode" in TV, in which characters sit around and talk for an entire episode, was created to save money and/or time, as in "we pulled that episode out of a bottle like a genie." Today it is revered, and shows like Seinfeld, Friends and Always Sunny have turned it into an art

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Zpd0D TIL that Charles Darwin's grandfather invented the buy one get one free deal to sell more pottery
69vBw TIL Use of amphetamines (such as Pervitin and Benzedrine) to stay alert and active longer was pretty widely used in WWII by both sides.
69Bkl TIL in 1937, Marion Anderson gave a concert at Princeton but was denied lodging at a local segregated hotel. Einstein invited her to stay at his nearby home. They became friends, and she often stayed at his house whenever she visited Princeton
69Vo7 TIL about the Dictionnaire Infernal, a book on demonology first published in 1818. Initially a work of fiction, author Collin de Plancy later converted to Roman Catholicism and amended the book: the final edition aligns with Catholic theology and affirms the existence of the demons.
mxD5x TIL a female cat can get pregnant by multiple male cats