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TIL That concert speakers that are placed further away from the stage need to have their incoming signals delay, in order to accommodate for the difference between the speed of electricity, and the speed of sound.

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EXM0 TIL that Eris, discovered in 2005, is more massive than Pluto and would have qualified as the tenth planet in the solar system, until its discovery prompted the International Astronomical Union to formally define ‘planet’ with a size cutoff that also excluded Pluto
xJA0 TIL that Nancy Sinatra (54 at the time) posed for Playboy in the May 1995
DQgxg TIL Nobel Prize of Physics recipient Tsung-Dao Lee was awarded in 1957 and is still alive 65 years later. He was 31 at the time.
QJwlM TIL that Japan converts footsteps into renewable energy in Tokyo train stations and use it to power billboards around the city, using special floor boards that turn vibration into energy.
AD9ba TIL of Cahkoia, a great Native American city near current day St Louis, which had a population in 1250 AD bigger than London