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Carl Sagan once wrote about the possibility that ancient Sumer was visited by benign extraterrestrial beings.
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A recently discovered cache of Assyrian cuneiform tablets has helped to reveal the location of a lost city.
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Archaeologists have unearthed the long-lost ruins of a 4,000-year-old city known as Xarab-i Kilashin.
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Archaeologists believe they have uncovered an ancient form of record keeping that pre-dates writing.