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— Robert Jastrow"Sometime in the first billion years, life appeared on the earth's surface. Slowly, the fossil record indicates, living organisms climbed the ladder from simple to more advanced forms."
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Either Stone Age man was a technological wizard, who carefully removed his technological achievements so as not to upset his inferior progeny, or our population dwindled from a once astronomical size to the mere three billions of today.
— Heinz von Foerster
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The critical first billion years, during which life began, are blank pages in the earth's history.
— Robert Jastrow
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