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TIL of “Anting” a behaviour in which birds rub insects (usually ants) on their feathers and skin. The insects secrete liquids containing chemicals such as formic acid, which can act as an insecticide, miticide, fungicide, or bactericide.

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nem8b TIL The candy PEZ is an abbreviation of the German word PfeffErminZ. Which translates to Peppermint.
lo4P5 TIL: The Roman emperor Caligula loved his horse Incitatus so much that he tried to turn the horse into a senator. His plan for equine politics was cut short by his assassination. Many historians believe the stunt was to humiliate his fellow senators.
b9nA7 TIL the Kinsey Reports on sexual behavior, considered to be among the most influential scientific books of the 20th century, were widely criticized for anonymously interviewing child molesters. Alfred Kinsey responded by saying it was necessary in order to solicit "honest answers on taboo subjects"
ANY0w TIL about Chaicharn Harnavee, a Thai Special Force and POW in Vietnam during the Vietnam War. For assisting the American POWs who shared his captivity, Harnavee received the Silver Star and Legion of Merit medals from the United States and his picture is hung in the Pentagon's Hall of Heroes.
VMvGD TIL the size and number of holes in Swiss cheese, also known as "eyes", can be controlled by adjusting the number of hay particles in milk used to make cheese.