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TIL a man walked onto an unlocked National Guard armory, started a tank with push-button ignition (no key required), and drove it through a San Diego neighborhood for 25 minutes.

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kxG7 TIL that the Hubble Telescope’s mirrors are ground so precisely that if they were scaled up to be the size of Earth, the largest bump would be 6 inches tall.
9Yk56 TIL A writer was caught for a murder only after a detective read his book about a fictional murder which contained similarities and details to the real life murder that only the killer would know about. Authorities also learned he was also planning to commit another murder to write book about
6EvN7 TIL that in 1978, Reinhold Messner reached the summit of Mt Everest without using supplementary oxygen, a task which had previously been considered impossible. Two years later, he did it again by himself, completing the first solo ascent of the mountain
oBrN7 TIL Scientists put slime mold onto a model of a map of Tokyo, with food representing urban centers. After a day, it created a network almost identical to Tokyo’s actual rail network. Human designers created that network to be as efficient as possible; slime mold did the same, but without a brain
a8OPo TIL Due to how Leap Year is calculated, President John Adams served the fewest days in office out of every one-term United States President as there was no Leap Day in February 1800