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TIL The singing voices of Homer, Apu, Barney, and Skinner in The Simpsons episode “Homer’s Barbershop Quartet” were provided by Disneyland’s The Dapper Dans

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GVbG TIL A hospital in Nanjing introduced an automatic sperm extractor for men. It has a massage pipe at the front with adjustable height, speed, frequency, amplitude and temperature. It also has a screen to display “artistic” movies. (Text and video)
0dWoN TIL: An octopus has blue blood and three hearts
aD0 TIL that the first retail product ever to be scanned using its barcode was a 10 pack of Wrigley’s chewing gum. This gum is currently on display at the Smithsonian.
6EZk7 TIL that in 1931, Gödel, a 25 year old mathematician, showed that there is a gaping hole at the bottom of mathematics. Simply put, there are things that are true that mathematics can never prove to be true.
kxbg TIL, when male lions take over a pride, they almost always kill the cubs. One reason is because female lions will not be receptive to mating while they are nursing, so killing the cubs enables the male lions to procreate.