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TIL the first Rain Checks were given to baseball fans in the 1870s as they left games that had been stopped due to rain. They were slips that allowed the fans to come back and see another game for free.

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nWmnb TIL of Treasure Island, which is the world's largest natural island sitting in a lake (Lake Mindemoya) that sits on an island (Manitoulin Island) inside of a lake (Lake Huron).
7rg4x TIL Covert consciousness "is consciousness that cannot be detected by bedside examination. Studies . . . suggest that approximately 10 percent of those believed to be in a vegetative state or a low-level minimally conscious state . . . can actually follow commands during functional MRI or EEG tests"
6xJW TIL Muhammad Ali believed that whites and blacks should be separated, supported George Wallace and once spoke at a KKK rally.
yVkKV TIL about Saint-Malo, Brittany. This city on the French coast has some of the highest tides in Europe, rising as high as 40 feet during parts of the year, and the water withdrawing hundreds of yards. A sea wall, built in the 17th century, protects the city from the tides.
Oo986 TIL that Somniosus microcephalus aka Greenland Sharks can live for more than 400 Earth years and sometimes don't even reach puberty until they're well in their 150s.