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TIL when the Grand Canyon divided the local squirrel population, they evolved into two different species. Despite being separated only by the Colorado River and remaining extremely similar in appearance, they are now so genetically incompatible that they can no longer interbreed.

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b90YE TIL First 13 Chernobyl firefighters were taken to Moscow and were treated according to Dr. Robert Gale's instructions and only 2 survived. Second group of 11 firefighters were taken to Kiev and were treated by a different method - all 11 were saved.
E1GRo TIL "bully insurance" is offered by companies in France and Japan to cover property damaged or stolen by other children, broken bones and shattered eyeglasses.
o6oR TIL the phrase “Keep your friends close but your enemies closer”, often attributed to Machiavelli or Sun Tzu, was actually first said by Michael Corleone in The Godfather Part II.
a8MlZ TIL Kassandra in Greek mythology was a Trojan priestess dedicated and cursed by god Apollo to utter true prophecies but never to be believed. Her name is used as a rhetorical device to indicate a person whose accurate prophecies, generally of impending disaster, are not believed by anyone.
KOkJ4 TIL about Operation Sea-Spray, where in September 1950 a U.S. Navy ship spent a week spraying bacteria into the air about two miles off the northern California coast. The secret project's goal was to determine the susceptibility of a big city like San Francisco to a bioweapon attack.