I was watching Nowhere in Africa the other night and it dawned on me that there are places in the world where people still live in societies that aren't much different from the ancient hunter/gatherer tribes. Why did some "advance" while others "stayed behind"?
If I had to guess, I would say it was the result of living in environments where people were constantly challenged to find better solutions for survival. I can see how this might lead to specialization of duties (some grew crops, some hunted, some made clothes, etc) and innovation.
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