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to 
leader--Genghis Khan-- went from an unknown member of a despised
tribe to a legend.
The waste of life that created the kingdom of Saudi Arabia, the
triumphs of the Vikings, and the conquests of the Mongols was
appalling.  But behind it were the same primordial principles that drive
the annual swarming of the ants--the superorganism's urge to expand.
And nature's addiction to playing dice with the bones of animals and
men.
  become nobles in an empire twice the size of the Romans'.  Their
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