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TIL Pink has no corresponding wavelength, it’s our brains filling in the gap between ultra violet and infra red light in the color spectrum. Put simply, pink is what you get when you remove the color green from white light.

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xVxB0 TIL that Thomas Edison Jr., unlike his famous father, was a terrible inventor. Eventually, he resorted to selling snake oil like the "Edison Magno-Electric Vitalizer", embarrassing his father so much that he was given an allowance of 900 dollars a week to stop marketing his own "inventions".
gM95b TIL even though the piano creates sound using strings, it is usually classified as a percussion instrument because the strings are hit by hammers to generate the sound, rather than plucked or bowed.
J1prj TIL Damon Albarn, the lead singer of Blur, is also the co-creator and lead singer of Gorillaz
E750 TIL Switzerland sent 31 soldiers to Afghanistan in 2003, its first military deployment since 1815.
LQv9m TIL of the Illusory Truth Effect which is when people will start to believe a lie if they hear it enough times simply because the "familiarity can over power rationality," causing something familiar to feel right.