Three figure-eight knots tied into strings may be the first word from the ancient Inca in centuries. While the Incan empire left nothing that would be considered writing by today's standards, it did ...
A cotton and agave fiber Inca khipu is seen at an exhibit at the Smithsonian National Museum of the American Indian in 2015 in Washington, D.C. (Brendan Smialowski | AFP via Getty Images) The Inca ...
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