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The Challenge of Understanding the Human Mind
The decimal positional system that we use now for representing numbers came to Europe in the 1700s with Fibonacci, right? So he takes it from the Arab world, which took it from India. There are lots of languages that don't have exact number words or have words that are just one, two, three, few and many. And some people, for example, there's a group in Papua New Guinea that has a base 27 that just starts with the fingers on one hand and goes across the top of your body.