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TIL a pro-gay film called “Different From the Others” was released in 1919 Germany. It is thought to be the earliest film ever made to show a sympathetic portrayal of homosexuality

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j6ZYa TIL Dogs can see color, but only in shades of blue and yellow. Because dogs can only see two colors, they have dichromatic vision. They can also see shades of gray. Colors such as red, orange, and green are out of a dog's color spectrum, so these colors are not visible to dogs.
N7Za6 TIL bone marrow transplants can cause "chimerism," which is the recipient's entire DNA changing into the DNA of the bone marrow donor.
grAOX TIL: Playboy is also published in braille. It eventually became the sixth most popular periodical in the U.S. National Library Service for the Blind’s Braille magazine catalog
OGndX TIL Pink Floyd's song "Is There Anybody Out There?" features dialogue from the 1967 Gunsmoke TV episode 'Fandango'. The actress who asks, "Is it unsafe to travel at night?" is Diana Muldaur, who played doctors in the original Star Trek series and Dr. Pulaski in ST:Next Generation.
K7bw TIL Lou Ferrigno once lifted a car by himself while playing the hulk instead of waiting for the broken steel lift to be repaired for the scene.