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      Knowledge is Power

      Scientific American January 1990

      50 and 100 Years Ago: January 1990

      Articles from the Scientific American archive

      • January 1, 1990

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      More in the January 1990 issue of Scientific American
      • Quasicrystal Clear
      • What Drives Glacial Cycles?
      • Artificial Intelligence: A Debate
      View Full Contents
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