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TIL that horseshoe crabs have blue blood which has the ability to respond to bacteria in a way like no other creature on Earth.

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bv5Q TIL that Guy Debord, French Marxist literary theorist, published his first book with a sandpaper cover so that books placed next to it would be destroyed
R7AJ1 TIL of Porajmos, Nazi Germany’s and its WWII allies’ effort to commit ethnic cleansing and eventually genocide against Europe’s Romani people. Later research cited by Ian Hancock estimated the death toll to be at about 1.5 million out of an estimated 2 million Roma.
pgA TIL that until a referendum in 1967, Aboriginal Australians were not considered human beings - they were instead classified under the Flora & Fauna Act.
6ryY TIL in 1996, as a April Fool’s Day prank, the Taco Bell Corporation took out a full-page ad that appeared in six major newspapers saying that it had bought the Liberty Bell and was renaming it the Taco Liberty Bell. The National Historic Park in Philadelphia received hundreds of outraged calls.
w8eY TIL Marilyn Monroes was Playboy’s first Sweetheart (later Playmate) of the Month. Marilyn had been paid $50 to model for the picture in 1949; Hugh Hefner bought it for $500 and launched an empire.