Isaac Asimov: The Far Ends of Time and Earth |
Species evolve only to meet the pressures of new environments. In a stable environment, a species may remain unchanged for millions of Centuries. Primitive man evolved rapidly because his environment was a harsh and changing one. Once, however, mankind learned to create his own environment, he created a pleasant and stable one, so he just naturally stopped evolving.
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Was there such a thing as an instinctive yearning on the part of intelligent beings to expand outward, to reach the stars, to leave the prison of gravity behind?
Volume 1, Page 533