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      Celebrate Math Awareness Month

      Scientific American September 2004

      Hiking Underground

      The longest cave in the world wends below Kentucky's Mammoth Cave National Park. Here visitors can view cave formation up close

      • By Marguerite Holloway

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      More in the September 2004 issue of Scientific American
      • Existential Terroir in Northern California
      • A Century of Einstein
      • Paleolithic Pensioners
      View Full Contents
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