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TIL Hermit crabs need to find new shells to move into as they grow. If one finds a shell that is too big it'll wait for a larger crab to come along so it can take their old shell. Other crabs congregate waiting for available shells and form a line from largest to smallest so they can all swap shells

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AVAa TIL: Wu-Tang Clan Rapper Ol’ Dirty Bastard (R.I.P.) saved the life of a 4 year old girl who had gotten trapped under a car after being ran-over. ODB ran to the scene of the accident and organized a group of about a dozen onlookers to lift the car off of the little girl.
40ww TIL 60% of Earth’s lakes are in Canada.
v1WXK Flying a helicopter on Mars is so damn hard but NASA made it possible. For the first flight, the helicopter took off, climbed to about 10 feet (3 meters) above the ground, hovered in the air briefly, completed a turn, and then landed. It was a major milestone: the very first powered flight in the extremely thin atmosphere of Mars, and, in fact, the first such flight in any world beyond Earth. Being able to fly a helicopter or drone on Mars is very important as they can cover 24 kilometers in an hour. By the way, Curiosity took nine years to travel less than 25 kilometers.
BgMZK TIL Che Guevara went to medical school and became a doctor. He considered it one of the turning points of his life.
aA6y TIL sleeping on the job is acceptable in japan. It is viewed as exhaustion from working hard. Some people fake it to look committed to their job.