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TIL at the British surrender at Yorktown in 1781, the British were marching facing the French army, ignoring the Americans. Marquis de Lafayette, commander of the American Light Infantry brigade, ordered his band to play Yankee Doodle, and the British troops instantly turned to face U.S. soldiers.

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9wKrB TIL about the "Rabbit Test," a human pregnancy test created in 1931. It involved injecting urine from a woman into a female rabbit. If the rabbit's ovaries showed enlargement upon dissection, it indicated the woman was likely pregnant, with about a 98% certainty. This was utilized until the 1970s.
Z1KG TIL that the name of textbook rental company, Chegg, comes from the contraction of chicken and egg, based on the founders’ experience after graduating from college; they could not land a job without experience, but could not get experience without a job, a chicken or the egg type of quandary.
WB4X TIL that there is a Patron Saint of the Internet
OoEK1 TIL Nobel Chemistry winner Theodor Svedberg developed the technique of analytical ultracentrifugation, and demonstrated its utility in distinguishing pure proteins one from another
DQgxg TIL Nobel Prize of Physics recipient Tsung-Dao Lee was awarded in 1957 and is still alive 65 years later. He was 31 at the time.