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TIL one of mathematician John von Neumann’s lecturers said “Johnny was the only student I was ever afraid of. If in the course of a lecture I stated an unsolved problem, the chances were he’d come to me at the end of the lecture with the complete solution scribbled on a slip of paper.”

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40Qw TIL we say “pardon my French” after swearing because in the 19th century, English-speaking people would drop French phrases into conversation to display class, apologizing because many of their listeners wouldn’t know the language. Then people hid swear words under the pretense of them being French.
OG0G1 TIL there are cells in the pancreas called the "Islets of Langerhans"
A1Kg TIL in 1994 a man named Tony Cicoria was struck by lightening while standing next to a public telephone, and resuscitated by a nurse who was waiting to use the phone. Not long after recovery he said his head became flooded with music. He bought a piano and is now a successful composer and performer.
Oo4VR TIL from the Battle of Hastings in 1066 the government of England spoke a type of French called Norman, while ordinary people spoke forms of English. Although Norman died out in England several hundred years ago, it continues in legal terms and parliament is still opened by the Queen in Norman.
oRy57 TIL that the 10,000 steps a day was an arbitrary number that came from a marketing campaign for an early pedometer launched ahead of the 1964 Tokyo Olympics. The number was chosen because the Japanese character for 10,000 resembles a person walking.