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TIL that in firing squads, one or more soldiers are given a magazine loaded with blanks so that each soldier can believe that they did not fire the fatal shot. For this reason, it is sometimes named the "conscience round"

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DXBY TIL Dolphins will communicate with one another over a telephone, and appear to know who they are talking to
GYMjj TIL that Robert Oppenheimer, "the father of the atom bomb" and the head of the Manhattan Project, once tried to poison his advisor for making him do experimental work instead of theoretical physics.
DQ5dv TIL with a "Constant acceleration" space ship, at 1G acceleration you could travel the diameter of the milkey way (105,000 Light years) in a short 12 years.
XWok TIL that President Ulysses S. Grant was arrested while in office. He was charged, booked, and released for speeding (on a horse) and had to pay a fine.
GY894 TIL super weaners are elephant seal pups who, in an attempt to slow their weaning, will steal milk from nursing female elephant seals ("milk thieves"), or be adopted by another nursing mother elephant seal ("double mother-sucklers"). Super weaners are usually male, and may weigh up to 600 lbs.