These knotted cords may hide the first evidence that the Incas collected taxes

Stringed devices called khipus are undergoing more research scrutiny, but most remain enigmatic

khipus

PAY UP A pair of stringed devices called khipus, unearthed at an Inca site in a basket covered with chili peppers, used knots to record taxes on stored quantities of those vegetables, researchers say.

G. Urton

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