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TIL about the Gibson Nine, an Australian aboriginal family who were still living a traditional nomadic lifestyle in the outback until 1984, when they settled in a town. The children have gone on to have successful careers as painters, although one of them later returned to the desert.

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lowP5 TIL Electrons in nuclear reactor water pools emit their own erie blue glow. Electrons can travel faster than light underwater and are called superliminal. The friction creates Cerenkov radiation which creates the blue light.
vPQER TIL some people experience "pregnancy nose" while pregnant due to hormonal changes where the nose swells due to dilated blood vessels
4X7P5 TIL about "Le Grand K", a hunk of platinum kept in a vault in a Paris, that until recently was the international prototype for a kilogram of weight. A kilogram's weight is now defined based on the laws of the universe so as to avoid a physical object that decays over time.
W7RBY TIL In 36 BCE, Roman statesman Marcus Varro wrote about germs, describing “minute creatures which cannot be seen by the eyes, which…enter the body through the mouth and nose and there cause serious diseases.” The germ theory of disease would not be accepted widely for another 1,900 years.
wL6GE TIL that England has no official national anthem. The United Kingdom's official anthem is "God Save The Queen," but England doesn't have one of its own. Various proposals have come up over the years, including the hymn "Jerusalem," but there's never been any consensus.