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TIL a physics professor proved mathematically that vampires could not exist since if they fed once a month and each victim became a vampire, within two and a half years the entire population of the earth would be one.

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e0814 TIL there exists a Linguistic Diversity Index: the probability [0-1] that 2 people selected from at random will have different mother tongues. Papua New Guinea comes first with a score of 0.988 as it has over 820 indigenous languages. Some other scores ~ India: 0.914, USA: 0.333, UK: 0.154
PK0V TIL that in one lifetime (of ~75 years) humans went from creating the first sustainable light bulb to building the first nuclear power plant (Obninsk).
8aP5P TIL that in 2009, British PM Gordon Brown hand-wrote a letter of condolence to a mother whose son had died in Afghanistan, in which he misspelled the son's surname. The Sun (a tabloid) wrote a scathing article criticizing his mistake. In this article, the paper misspelled the same name.
nWypo TIL a "lost" 1976 episode of Sesame Street that was reportedly removed from syndication for being too frightening for children resurfaced online in 2019. It starred Margaret Hamilton reprising her role as the Wicked Witch of the West from "The Wizard of Oz."
dDenr TIL Jerry Zucker, director of Ghost (1990) didn't want Patrick Swayze or Whoopi Goldberg to audition, saying "over my dead body will Patrick Swayze ever play this role." Patrick ended up securing the part and helped change Jerry's mind on Whoopi Goldberg...the role she would win an academy for.