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TIL in 1958 singer Ross Bagdasarian began playing with the speed function on a tape recorder, speeding it up to make high pitched voices. Using overdubbing and performing all the voices, he came up with "The Chipmunks" which sold millions that Christmas.

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KYAN4 TIL In the 1980s, DeCasper studied whether fetuses could hear mothers’ reading. In several months, infants were tested to choose recordings with different stories to listen to. Surprisingly, but most of children chose to listen to the stories that their mothers had read to them prenatally
LOvr TIL in the early 1900s, a Kansas doctor performed over 16,000 procedures replacing impotent men’s testicles with goat testicles, believing it would not only restore their sexual virility, but also cure 27 other ailments, ranging from dementia to emphysema to flatulence.
woGQW TIL that there is a house in India who claim to be the legitimate heirs of the Kingdom of France! The house of Bourbon-Bhopal claims to be descended from Jean Philippe de Bourbon, an exiled French noble who served in Mughal Emperor Akbar's court.
GAnv5 TIL The internet was born in 1969. Which happens to be the last year that the Beatles performed in public.
jNnJM TIL of the sunk cost fallacy. It is the general tendency for people to continue an endeavor, or continue consuming or pursuing an option, if they’ve invested time or money or some resource in it, which becomes a fallacy if it’s pushing you to do things that are making you unhappy or worse off.