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79: 1 2 3 (Counting)
Breaking Math Podcast
The History of Babylonian Numbers
The Mayans came up with the base 20 system because of fingers and toes. Sideways, but within each numeral sideways wedges meant 10 and up and down wedges meant one. And what's weird is that the Mayans have two years, one that's accurate and one that's 360 days. It's a ceremonial year. The second one from the bottom in the ceremonial dates is actually base 18.
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