Knotted threads carry signs of ancient accountancy.
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References
UrtonG. & BrezineC. J. Science, 309. 1065 - 1067 (2005).
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Textile Museum in Washington DC
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von Bubnoff, A. Scientists untangle Inca number-strings. Nature (2005). https://doi.org/10.1038/news050808-11
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DOI: https://doi.org/10.1038/news050808-11