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TIL because of its slow rotation one "day" on mercury equals 59 earth days. It orbits the Sun in a 3:2 spin–orbit resonance, rotating on its axis exactly three times for every two revolutions around the Sun meaning a day lasts twice as long as its year.

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aWKL TIL that USMC Scout Sniper training includes having to move within 200 yards of an observation post and shoot at it twice without being spotted, the second shot with an indicator within 10 yards of the sniper. To pass the course you have to remain unseen at least twice.
R7Mej TIL of a religious cult known as the "Prince Philip Movement", located on the island of Tanna in Vanuatu. It's followers worship Prince Philip and believe that he is a divine being.
wWd7 TIL: In “Batman and Captain America”, the Joker teamed up with a character named Red Skull. However, on learning the character was actually a nazi and not just pretending, the Joker turned on him, proclaimed “I may be a criminal lunatic, but I’m an AMERICAN criminal lunatic!”
L4yp TIL that whales, sturgeon, dolphins and porpoises that wash up on the shore in the UK are “royal fish” and are property of the Queen.
1aAG4 TIL US Navy's submarine periscope controls used to cost $38,000, but were replaced by $20 xbox controllers.