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Archaeologists and historians have puzzled about where ancient people got the mathematical skills to construct and run their calendars. After all, they were not even known to have written language. So how could they have higher math? The answer is simple. The math was in the autistics. It was inborn, in their minds. Practice makes better, but formal teaching was not needed. That's evident in today's calendar calculators.
--Were the Timekeepers of the Ancient World Autistic? | Psychology Today