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TIL that there are 6,670,903,752,021,072,936,960 possible solvable Sudoku grids

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VBWL4 TIL Claudius Ptolemy made a list of the angle in water for each number of different angle in air, as recorded on a table from 140 AD. But it was not until 1621 when Willebrord Snell found the rule connecting the two angles: sinθi=nsinθr
KOvKJ TIL Leslie David Baker, who is best known for playing Stanley Hudson on The Office, made a music video about how he likes his sex.
kMX5 TIL Tom Berenger once owned a restaurant called Twins, where the waitstaff consisted of 29 sets of identical twins.
Y7RlZ TIL when the word "pussy" popped up in regular dialogue around the sixteenth century, it didn’t have a sexual connotation at all. It was used as a term of endearment to describe women in general and didn’t actually get sexual until the nineteenth century
bPG4 TIL that no one knows who invented the fire hydrant, because its patent was burned in a fire.