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Though walking upright with big brains, humans were still a pretty primitive species at the time.

Hieroglyphs were difficult to learn, time-consuming to create, and only priests and civil officials used them.About 200,000 years ago, we evolved to become the most important force for change on the planet.Our knack for collective learning — preserving information, sharing it with one another, and passing it to the next generation — helps us create entirely new forms of complexity.So when farmers domesticated their livestock it represented a revolution, as animals could till more land and carry more goods over distances, helping farmers connect to and feed more communities.As humans abandoned foraging, farming claims the vast majority of credit in explaining the birth of civilizations. A recent discovery in the limestone pillar ruins at Göbekli Tepe, Turkey, archaeological evidence suggests that this was a temple. There was simply nothing about the site to suggest anything domestic.