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      Scientific American July 2000

      Knotting Ventured...

      Ian Stewart shows how pieces of string can illustrate the principles of symmetry

      • By Ian Stewart on July 1, 2000

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      More in the July 2000 issue of Scientific American
      • 50, 100 & 150 Years Ago: Smoking and Cancer and Pioneers of Flight (or Fright)
      • Darwin's Influence on Modern Thought
      • Letter to the Editors - July 2000
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