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TIL there is an immortal species of jellyfish

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OGQRe TIL that in 1963, the British army tested how long a WWI Vickers Machine Gun could fire. It fired 5 Million Rounds, Firing Continously for Seven Days, an Average of 500 Rounds Per Minute for 10 000 Minutes.
lmbA TIL The mortality rate for cheetah cubs in the wild is about 70 percent, while it is only 20 percent for those under human care.
loQ0B TIL Apple tells moviemakers that villains can’t use their products.
7Wxp TIL that gloves were introduced to boxing to make the sport more violent and dramatic.
7nDb TIL You aren’t supposed to wear white after Labor Day due to an old fashion rule made by rich women to separate “Old Money” people from “New Money” people.