Life went through some incredible changes when the first cities were built. Up until then, nearly every person had to work as a farmer or a hunter, moving from place to place in a constant struggle to survive. All that changed about 7,000 years ago, when Sumer, the first civilization, began. For the first time in human history, people moved into the safety of a walled city. For the first time, they didn’t have to hunt or farm. They could become builders, astrologers, and teachers...
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