The Amazing Incan Khipu: Textile Accounting

Once, on Facebook I wrote:

https://www.nytimes.com/2016/01/03/world/americas/untangling-an-accounting-tool-and-an-ancient-incan-mystery.html?smprod=nytco

Amazing. In a lush jungle paper / ink / double-entry accounting fails. Solution? Khipu!

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