New York, USA (Newsday): Three figure-eight knots tied into strings may be the first word from the ancient Inca in centuries. Many of these strings have turned out to be a type of accounting system, but interpreting them has been complex. Gary Urton and Carrie J. Brezine of Harvard University say they have found a three-knot pattern in some of the strings, called khipu, that they believe identifies them as coming from the city of Puruchuco, about seven miles north of modern Lima, Peru.