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TIL the stereotype of Native Americans saying "how" as a greeting comes from the Anglicization of the Lakota word "háu", which was used by men to greet other men.

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Wk61A TIL that the Colombian army once made a song with Morse code in it and aired it in rebel-controlled territory to lift the morale of hostages held there. The message read '19 rescued, you're next. Don't lose hope.'
LQN9P TIL that most states in the USA have an official state fossil, for example the Stegosaurus stenops for Colorado.
mxpZv TIL that a farmer called Almon Strowger invented automatic telephone switching because he didn't trust his local telephone operator. She was the wife of his competition and Strowger suspected that she was diverting requests for his services to her husband’s business instead.
0d9KN TIL Like casinos, shopping malls are intentionally designed to disorient visitors. The feeling of losing track of time and geography inside a mall is called the Gruen Transfer.
gQlW Request for identification of frequent TILs reposts. Provide TIL reddit link as a top-level comment.