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‘Not the first time there’s been a civilization in the universe’

The spectacular rise of human civilization—its agrarian societies, cities, states, empires and industrial and technological advances ranging from irrigation and the use of metals to nuclear fusion—took place during the last 10,000 years, after the last ice age. Much of North America was buried, before the ice retreated, under sheets eight times the height of the Empire State Building.  Read more.

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