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May 14, 2024, 10:37 pm UTC    
December 03, 2006 07:27PM
Why on earth would they use a base 40 system? I can see 10 (hands) or 20 (hands and toes)... but 40?
Subject Author Posted

Incan Yupana Abacus

Allan Shumaker December 02, 2006 07:06PM

Re: Incan Yupana Abacus

archaeo December 02, 2006 07:19PM

Re: Incan Yupana Abacus

Byrd December 03, 2006 07:27PM

Re: Incan Yupana Abacus

Allan Shumaker December 03, 2006 07:48PM

Re: Incan Yupana Abacus

archaeo December 03, 2006 09:13PM

Re: Incan Yupana Abacus

JoshG December 03, 2006 09:35PM



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