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TIL the Pledge of Allegiance was created as part of a marketing campaign to sells flags to public schools.

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nWLp7 TIL Why Months Have Clearly Numerical Names That Don’t Align With Their Place in the Calendar
4ekb TIL of “Operation Flex”, which took place in California in which an FBI informant pretended to be a radical Muslim, the members of the mosque quickly got a restraining order on him and reported him to the FBI.
XE1Kj TIL Harriet Tubman, in addition to organizing the Underground Railroad, served with the U.S. Army as a scout, spy, nurse and soldier during the Civil War, leading a raid with the African-American 2nd South Carolina regiment that freed over 700 slaves.
9meM TIL that male chimpanzees are less than 0.01% body fat. Very lean human males average 6-9% body fat.
R5Knw TIL the children's song "Playmate" was first recorded by multiple artists in 1940, with the melody plagiarized from a 1904 song, "Iola."