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TIL that during Star Trek filming, censors required actresses not to show their navels. Gene Roddenberry was so irked by this that he made the villains in his 1973 TV movie "Genesis II" identifiable by each having two navels, thus filming each navel he’d previously been forced to censor twice over.

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7EXP TIL Finnish schools use a considerable amount of time to teach crafts and arts skills, like home economics, textiles, and woodwork. Unlike in other countries, where these subjects are treated as an awkward add-on, in Finland they have become a cornerstone of a child’s education.
XeJ8 TIL: That one of Bill Nye the Science Guy’s professors at Cornell was Carl Sagan.
J1a08 TIL that jazz composer Duke Ellington had synesthesia, hearing sounds as colors and seeing colors as sounds
wow4W TIL in the early 1990s Amsterdam airport came up with an ingenious design “to etch an image of a black house fly” to reduce spillage in men’s wall mounted urinals. The result: spillage was 80% reduced. Lesson learnt- If you give men a target, it turns out, they can’t help but aim at it.
0wnYy TIL That people who grew up with black and white tv dreamed in black and white about a quarter of the time. People who were under 25 at the time only dreamt in black and white about 4.4% of the time