If the material evidence of modern civilization should be left to ruin by world war or other cataclysm, archeologists thou sands of years hence might find the remains of skyscrapers, subways, concrete highways, pottery, glass, jewels, coins, some tools, the debris of machinery. The written records would have crumbled to dust, and the archeologists might conclude that the inhabitants of the present world were half-literate savages gifted with great engineering ability. But if future diggers explored the broad Mesopotamian valleys of the Euphrates and Tigris, in what is now Iraq, they...
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