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TIL Tacit collusion is when groups work together without an explicit agreement. One example is price leadership inwhich one company changes their prices and competitors follow. In one case automated price setting led to the book The Making of a Fly having a price of $23,698,655.93.

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wL4jJ TIL there are rocks in California that are highly-polished from the suspected rubbing extinct Columbian Mammoths performed on them 1,000s of years ago during the Ice Age.
VDpp TIL of Emmett Till, a black teenager who was murdered after allegedly whistling at a white woman. He was so badly disfigured that the only way he could be identified was through his ring. Years later, the woman in question admitted that she fabricated parts of her story.
D1RMp TIL The widowhood effect is the increase in the probability of a person dying a relatively short time after their long-time spouse has died. The pattern indicates a sharp increase in risk of death for the widower, particularly, in the three months closest thereafter the death of the spouse.
6EOAQ TIL the deepest hole humans have dug is known as the Kola Superdeep Borehole in the far northwest of Russia. It is 40,230ft deep (12.2km). The locals say that can hear the screams of souls tortured in hell. It took the Soviets 20 years before the end of The Cold War scrapped the project.
ADKll TIL the Canadian Football League's Edmonton Eskimos have decided to keep their name, with the blessings of the Inuit people