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TIL modern capital letters are characterized by straight lines and supple curves to make them easier to carve into stone. Lower case letters were only used for everyday writing and weren't originally used in conjunction with upper case.

16yQr TIL that, due to an infection in his youth, famed agricultural scientist George Washington Carver had such a high pitched voice that it “startled all who met him.”
nWo0B TIL: The Artic Circle and Antarctica are named for Arktos (Greek for Bear) Antarctic = No Bears. While there are no polar bears in Antarctica, the "Bears" in question are Ursa Major and Ursa Minor (which contains the North Star) - Neither constellation is visible from Antarctica (i.e. NoBears land)
oRyOA TIL: Humans are uniquely efficient at conserving water compared to other primates, using 30% to 50% less daily. A study published by Duke University revealed this trait, which likely helped our ancestors survive by traveling further in search of food without needing water sources nearby.
Y7eWP TIL about the Diomede Islands - Big Diomede is in Russian territory, Little Diomede is in the U.S. They're just 2 miles apart, but due to the International Date Line, Big Diomede is 21 hours ahead of Little Diomede.
ne8dd TIL that the US Constitution mandates that citizens to Representatives are on a 30,000:1 ratio. This was eliminated in 1929 with the implementation of cap at 435 total representatives. The current ratio is currently about 770,000 citizens to each Rep.