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TIL that scientists believe that early human ancestors used to have three eyelids. One of the eyelids eventually became the small fold in the corner of human eyes today.

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Yp56d TIL Kodak color film was originally calibrated for white skin and only changed after furniture makers complained the photos didn't accurately reflect the color of their wood products. (racial bias in photography)
DARY TIL in 1892, during a massive general labor strike in New Orleans, white and black workers united in an effort to gain better working conditions. Although commercial representatives tried to divide the workers by race, spreading stories of ‘negro mobs’ victimizing whites, the workers remained united
vPZl4 TIL Members of the Australian would cover their head with a paper to attract the Speaker's attention. This practice was never included in the rules for the Australian Senate or House of Representatives.
pY0PO TIL Mercury is closer to Earth, on average, than Venus is because it orbits the Sun more closely. Further, Mercury is the closest neighbor, on average, to each of the other seven planets in the solar system.
epWB6 TIL that until 1976, the US Army shared responsibility with the Marines for transporting the President by helicopter. When crewed by their personnel, the aircraft was known as "Army One".