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TIL that the dots in microwave oven doors are to keep radiation from escaping. This is accomplished because the dots are smaller than the wavelength of the radiation in question, creating essentially a faraday cage.

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XjbX TIL the Alferd G. Packer Memorial Grill in the cafeteria of UC Boulder is named after an infamous cannibal who ate his five companions during their journey across the Rockies in 1874. Their slogan is, “Have a friend for lunch!”.
kOLj1 TIL at least 749 American servicemen were killed in England, April 1944, during large-scale rehearsals for D-Day. Rumoured 450 friendly fire deaths were followed the next day with 749 deaths by attacking E-boats. The incident was under the strictest secrecy and was only nominally reported afterwards
RPg6 TIL a creationist used the shape and appearance of the banana as proof of intelligent design. He later retracted his statements upon learning that bananas are a result of artificial selection by humans.
GYLkE TIL Ron Swanson, Parks and Recreation, was loosely based on a real life government official. The creators discussed the role with a government official from Burbank, California. She said she could relate with the character because she didn’t “really believe in the mission” of her government job.
ANW6d TIL about Ron Hunt, a construction worker who was impaled through his eye and skull by and 18inch long, 1.5 inch diameter drill bit and survived. (X-ray in comments)