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      Digital & 4-Year Archive

      Scientific American April 1998

      Endangered

      Other explanations now appear more likely than Martian bacteria

      • By W. Wayt Gibbs on April 1, 1998

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      More in the April 1998 issue of Scientific American
      • Laser Scissors and Tweezers
      • Cosmic Antimatter
      • In Brief, April 1998
      View Full Contents
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