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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.

b9Kn4 TIL that a large alliance of Native American tribes, the Timucua, consisted of over 200,000 people spread across 35 chiefdoms. They were probably the first Natives Ponce de Leon met in Florida. The nation was wiped out before 1800 and all evidence of religious items and art were burned by explorers.
Z8EN4 TIL The Rock was given an uncredited rewrite by British sitcom writers Dick Clement and Ian La Frenais, creators of The Likely Lads and Porridge.
KZAQ TIL Whenever Hugh Hefner’s daughter, Christie, came to visit the Playboy Mansion as a teenager, “the mansion was cleaned up with all the kinky stuff put away” in an effort to keep her from knowing what was going on. She later became president of the company.
Me5LV TIL the Chinese city of Fancheng held out for nearly 6 years against the Mongols - until Kublai Khan's nephew sent him Muslim engineers from Iran that built counterweight trebuchets, with a range of 1,600 ft. and launching projectiles weighing 660 lbs. The city fell within a few days.
v1moL TIL that Niel Armstrong was misquoted when he took his first step on the moon, instead of what most people think he says which is, "That's one small step for man, one giant leap for mankind." It's actually "That's one small step for A man, one giant leap for mankind."