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TIL General George G. Meade had only been in charge of the Union Army for 3 Days before the Battle of Gettysburg began. The subsequent fight was not only the bloodiest battle in the American Civil War, but considered a turning point by many Historians

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8alP4 TIL the Ozma problem is an old problem asks if we could communicate the concept of left and right to an alien over the radio. In the 1950's physicists found a way when they observed that certain radioactive decays actually "care" about if the atom is spinning clockwise or anti-clockwise.
WkyW4 TIL: Ozzy Osbourne from Black Sabbath once fell asleep during a driving test, waking up to a note saying 'you have failed'. He passed in 2009, age 60, on his 19th attempt.
XBaD TIL in the song “Misunderstood”, John Petrucci wrote and played the guitar solo, and then reversed it. He then learned how to play this reversed version, and after recording it, reversed it once more. This resulted in a solo like the original but with a unique twist to the way the notes sounded.
W7MdY TIL The Grateful Dead song Eleven is called that because it is played in the time signature of 11/8
Brb0x TIL, there’s a bunch of extremely useful punctuation marks that are barely ever used, such as the “Question Comma”.