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TIL that researchers believe that up to 65% of people with Klinefelter syndrome (XXY chromosomes) are never diagnosed. The condition usually isn't diagnosed until puberty or adulthood because of how mild the symptoms are.

Read more medlineplus.gov

via reddit.com

worRo TIL horses were introduced to the American South in 1630, and had made it to Canada by 1730
RJVa TIL Steve Jobs was diagnosed with a rare form of non aggressive pancreatic cancer that was entirely treatable. Jobs then resisted standard treatment for 9 months, choosing to try and treat his cancer with a vegan diet. This led to the cancer becoming untreatable and him losing his life.
dy18 TIL that Oxford University is so old, one of its contituent colleges called “New College” was established in 1379.
4XeOw TIL Eddie Deezen, who played a ton of movie nerds in the 70s and 80s and who's role as Eugene in Grease is considered the archetype for the movie nerd, was turned down for a role in "Revenge of the Nerds" because he was "too geeky"
R5KX9 TIL Gene Roddenberry's only appearance in Star Trek was as a ship's chef who told Captain Kirk that the turkey-shaped meatloaf in the galley ovens had turned into real turkeys.