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TIL during world War II, the army would pour ice cold water in the ear of "draft dodgers" who pretended to be deaf. The normal response is to turn the eyes to the ear with cold water (Caloric reflex. About half of deaf lack this reflex). No response = truly deaf. Response = Possible draft dodger.

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ADXlB TIL Neanderthals approached animals very closely and thrust, not threw, their spears at the animals, most likely from an underhand angle. This confrontational way of hunting required careful planning and concealment, and close cooperation between individual hunters.
4XaZo TIL the idea for the Guinness Book of World Records was conceived when Sir Hugh Beaver (Managing Director of the Guinness Brewery) attended a party in Ireland in the early 1950s, where he and his hosts argued about the fastest game bird in Europe* and failed to find an answer in any reference book.
oBraL TIL about the huge environmental impact of cut bunches of flowers due to the fact that most are grown in South America using pesticides banned in the West, trucked to and from airports, and flown around the world representing an enormous carbon footprint.
4keeX TIL that, the first Lockheed U-2 spy plane pilots, during extended flights, wore suits equipped with an indwelling urinary catheter. This tube, inserted through the penis into the bladder, siphoned urine into a bag. This suite and solution was unpopular among pilots
OGyNX TIL that since Rain Man (1989) over 1/3 of Academy Awards for Best Actor went to Actors portraying people with disabilities