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TIL the famous “shave and a haircut” door knock is morse code for “Attention” which is also the greeting used for code messages.

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xVkRB TIL one theory why the human sense of smell is worse than our closest ancestors (monkeys and apes)is that since the start of agriculture, humans have been forced to live in crowded tents and huts with many other people, so we evolved a weaker sense of smell to better deal with it.
VBLv0 TIL as of 2020, 78.7% of Singapore residents live in public housing, down from a high of 88.0% in 2000
JYOLv TIL of the Genain quadruplets. Four identical quadruplet sisters born in 1930 who all developed schizophrenia, suggesting a strong genetic component to schizophrenia.
e0GEn TIL that when Bobby Pickett finished the demo of "Monster Mash" in 1962, it was rejected by every major music label. Finally a willing producer was found, and it hit #1 on the Billboard charts, went gold x3 its first week, and has charted in multiple years since.
4POJ TIL a Nazi officer saw a photo of Picasso’s Guernica, a painting highlighting the horrors of war. The officer asked Picasso, “Did you do that?” and Picasso said, “No, you did.”