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TIL Pelorus Jack was a dolphin that used to guide ships through a notoriously dangerous channel in New Zealand. In 1904 someone aboard the SS Penguin tried to shoot Jack with a rifle, he survived and continued to guide all ships except the SS Penguin.

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N755P TIL the giant crystal cave in Mexico, with crystals weighing up to 50 tonnes, had an average of 100% humidity and 58° C temperature. This meant that the coldest place in the cave was the lungs, so water would condense in it and exposure for over 10 minutes would lead to death by drowning.
X0jjP TIL J.R.R. Tolkien loathed Walt Disney, seeing his work as corrupt, deceptive commercialism. Disney films nauseated him, and he saw Snow White as a vulgar mockery of mythology. He refused to let Disney adapt The Lord of the Rings.
GYNN7 TIL - Former Yahoo CEO Marissa Mayer had a nursery built for her newborn in her office. This was at the same time she stopped allowing parents and others from working from home.
LkvlP TIL that Pythagoras invented a "Greedy Cup" which would empty onto the user when overfilled.
X0OY6 Today I learned Marine invertebrates that occur at the poles in really cold water tend to have much larger body sizes than their relatives that live elsewhere