mud-plastering fashioned them into huts and byres. Later, the Sumerians invented the brick mold for shaping and baking the ubiquitous river clay and so had no more building-material problem. They devised such useful tools, skills, and techniques as the potter's wheel, the wagon wheel, the plow, the sailboat, the arch, the vault, the dome, casting in copper and bronze, riveting, brazing and soldering, sculpture in stone, engraving, and inlay. They originated a system of writing on clay, which was borrowed and used all over the Near East for some two thousand years. Almost all that we know of
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