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TIL it is possible to checkmate an opponent in chess in two moves

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oBoO7 TIL that if you look at a blue sky you can actually see white blood cells moving around in your eyes.
8eeeb TIL, in 1989 in Tacoma, WA, Army Ranger buddies at a bbq were threatened by Crips in the neighborhood. The Rangers called more buddies, who brought more firearms. They set up defensive positions and a shoot-out ensued later that night when the Crips made a move on the house.
N7EVN TIL about an erotic fetish called vorarephilla. Which is a desire to get swallowed by somebody whole or to swallow somebody or something.
yVLjX TIL that Operation Denver was an active measure disinformation campaign run by the KGB in the 1980s to plant the idea that the United States had invented HIV/AIDS as part of a biological weapons research project at Fort Detrick, Maryland.
oJwE TIL Valium was given to whales at SeaWorld to keep them calm, documents that a veterinarian at SeaWorld gave diazepam (Valium) to at least three orcas in 2006 in order to control their behavior.