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TIL about the white-throated sparrow, where male and female birds each exist in two forms: a white morph and a tan morph. Tan morphs only mate with white morphs, creating four different groups of birds that each act like a distinct 'sex' - tan males, tan females, white males and white females.

VBGw8 TIL that during the 19th Century, "&" was taught as the 27th letter of the alphabet. The alphabet ended with "X, Y, Z, and per se and", but this became slurred over time until it just became "ampersand".
W7gQ9 TIL President Calvin Coolidge had a pet racoon named Rebecca who was originally gifted to him to eat for Thanksgiving dinner
1GKW TIL John DiMaggio, mostly famous for being the voice behind Futurama’s Bender, is also the voice of Jake the Dog from Adventure Time, Four Arms from Ben 10, Schnitzel from Chowder, Marcus Fenix from Gears of War, Brutes from the Halo Series and the list goes on.
M7AvW TIL Star-Planetary Systems are named after the name of their Star, our star's name is Sol. That's why our system is called the Solar System. Our nearest neighbouring star is Proxima Centauri and its system is called the Proxima Centauri System. "Solar System" is not a generic/categorical name.
1abxX TIL about Quaker and slave trader Zephaniah Kingsley, Jr. who advocated, and practiced, racial mixing as a way toward ending slavery. These views were tolerated in Spanish Florida. After Florida became a U.S. territory in 1821, he moved with his multiple "wives", children, and slaves to Haiti.