people of Sumer had an unusual flair for technological invention. Even the earliest settlers had come upon the idea of irrigation, which made it possible for them to collect and channel the rich silt-laden overflow of the Tigris and Euphrates rivers and use it to water and fructify their fields and gardens. To make up for the dearth of minerals and stones, they learned to bake the river clay and mud, the supply of which was practically inexhaustible, into sickles, pots, plates, and jars. In lieu of the scarce building timber, they cut and dried the huge and plentiful marsh reeds, tied them
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