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TIL that movement of the tides causes a loss of energy in the Earth-Moon system. In the last 620 million years the period of rotation of the Earth (length of a day) has increased from 21.9 hours to 24 hours; in this period the Earth-Moon system has lost 17% of its rotational energy.

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WwkA TIL that, while some karate schools teach well, others don’t really do anything and exist solely to take your money. These ones that spring up all over the place are commonly known as “McDojos”.
PYaXE TIL of ‘Sin Eaters’ whose job it was to “eat” the sins of a deceased person. The position only paid a couple dollars per sin eating and it usually called for the individual to eat a piece of bread that had been sitting on the dead person’s chest or lips.
oRRmR TIL that John Cena chose to act in all three "Fred" movies on Nickelodeon because he thought that the character's popularity was a cultural milestone and that Lucas Cruikshank's (the main actor) quick rise from posting on YouTube to getting a movie deal was the embodiment of the American Dream.
JYxVj TIL of Jenny Wade, she was the only civilian casualty of The Battle of Gettysburg. Between 46,000 and 51,000 soldiers from both armies were casualties in the 3 day battle, the most costly in US history. Wade was killed by a stray bullet while kneading dough in her kitchen.
45w5 TIL Winfield Scott served in the War of 1812, and the Civil War. Roughly equivalent to someone serving in both WWI and Vietnam.