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TIL the phenomenon where you see faces in things (i.e. "The Man On The Moon" or cars) is called Pareidolia

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BrQYD TIL JRR Tolkien was a supporter of the constructed language Esperanto, believing it could help unite Europe after World War I. He also created new languages like Elvish, calling it his "secret vice", and explained that for him the purpose was aesthetic rather than pragmatic
WkPBA TIL: Hummingbirds continue to learn new songs and can adapt older songs throughout their lifetimes.
X008k TIL David Lunt revolutionized amateur astronomy by introducing the first hydrogen-alpha solar telescopes for consumers in the late 1990s. Through his telescopes, the ruby-red Sun looks alive, with prominences jutting from the limb, and bright flares erupting around sunspots
4XmDN TIL every location in the universe has its own observable universe, which may or may not overlap with the one centered on Earth.
ZpD1v TIL that in the late 1800's and early 1900's, gambling on US elections was extremely widespread. In New York, the amount of money spent on betting on elections would often exceed the total trading in stocks and bonds. Since there weren't modern polls, betting odds were how newspaper predicted races.