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TIL that the trippy patterns that you see when you shut your eyes tightly are called phosphenes. They are caused by electrical charge produced in the retina and or mechanical stimuli such as rubbing your eyes

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QJGYe TIL Beauty and the Beast was written in 1740 as a critique of the forced marriages between 13-15 yr old girls to adult men common at the time. Later versions shifted the emphasis to teach young girls "good manners and how to deal with the idea of marrying young and being in an arranged marriage."
6EmVZ TIL on the show "Lassie".. Timmy wasn't always named Timmy.. He was originally named Jeff.. and he NEVER actually fell in a well..
WXXL TIL IBM made a movie by moving atoms and recording them with an electron microscope.
Jjom TIL in 1985, the writers of Sesame Street decided that the adult characters needed to be shown to believe Big Bird about Snuffleupagus due to concerns that if they did not, children would fear that adults/parents would not believe them about an adult abusing them if they told.
0wo7R TIL during world War II, the army would pour ice cold water in the ear of "draft dodgers" who pretended to be deaf. The normal response is to turn the eyes to the ear with cold water (Caloric reflex. About half of deaf lack this reflex). No response = truly deaf. Response = Possible draft dodger.