The ancient Sumerians, builders of the world’s first known civilization, are a mystery to us. Settling in what we would now call southern Iraq from about 5400 BCE on, they produced a written language, a complex system of mythology, impressive architecture, and a lost world that held regional hegemony for thousands of years. We don’t know where their language came from; we don’t even know where their genes came from. We have no idea who their modern descendants would be, and we’ve never been able to test the DNA of Sumerian remains.
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