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      Knowledge is Power

      Scientific American May 2004

      Retooling the Global Positioning System

      From hikers navigating with handheld locators to pilots landing in zero-visibility conditions, the Global Positioning System now serves more than 30 million users. See what's coming next

      • By Per Enge on May 1, 2004

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      More in the May 2004 issue of Scientific American
      • Making Drugs, Not Profits
      • The Myth of the Beginning of Time: Two Views of the Beginning
      • Bush-League Lysenkoism
      View Full Contents
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