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Humans, for the most part, count in chunks of 10 — that's the foundation of the decimal system. Despite its near-universal adoption, however, it's a completely arbitrary numbering system that emerged for one very simple reason: We have five fingers on each hand. But as many mathematicians like to point out, base-10 is not without its problems. The number 12, they argue, is where it's really at. Here's why we should have adopted a base-12 counting system — and how we could still make it work.