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TIL that Galileo’s telescope discoveries supported heliocentrism—the idea that Earth orbits the Sun. In 1633, he was tried by the Inquisition for his findings and spent the rest of his life under house arrest.

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pYAoO TIL In Mongolia, 'humans' are the fifth most abundant medium to large mammal. (Sheep > Goats > Cattle > Horses > Humans > Camels) There are 20 livestock per person in Mongolia, although this fluctuates from year to year. Not including wildlife.
oWkL TIL sausages have the nickname “bangers” in Britain because during World War II rationing the sausages would be filled with so much water they would explode on the grill.
woN97 TIL the Pennsylvania Railroad (PRR) company's main competitor was Vanderbilt's New York Central Railroad which controlled the only rail access into Manhattan. In 1899 Alexander Cassatt came out of a 17 year retirement to head PRR and visited Paris where he was saw the first electric terminal.
PYPeE TIL that beer mugs are not called "steins" in Germany. "Stein" is the German word for "stone." The English word "stein" probably comes from the German word "Steinzeug" which means "stoneware"—the type of pottery that cheap beer mugs are often made of.
PYgBJ TIL About the Treaty on Open Skies. This treaty, signed in 2002, allows signatories to fly unarmed reconnaissance aircraft over each other's territories in order to ensure complete transparency and trust. Countries that have their area observed can request any imagery taken, at their own cost.