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      Digital & 4-Year Archive

      Scientific American April 1992

      Ballpark Physics

      Automating the scribbles on engineers' envelopes

      • By Gary Stix on April 1, 1992

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      More in the April 1992 issue of Scientific American
      • First-Class Culprit
      • Solid Acid Catalysts
      • Vexing Vortices
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