Incan numerical recordkeeping system may have been widely used

Ars Technica
By Kiona N. SmithAug 14, 2025, 12:10 pm166 pts
Inca bureaucrats recorded all the goings-on in their bustling empire using knotted cords called khipu, where the position and order of the knots represented numbers. They relied on the khipu system to track people, taxes, produce, livestock, and products like woven cloth and beer. Because khipu were so vital to…

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