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      Knowledge is Power

      Scientific American April 1986

      50 And 100 Years Ago: April 1986

      Articles from the Scientific American archive

      • April 1, 1986

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      More in the April 1986 issue of Scientific American
      • The Amateur Scientist, April 1986
      • The Quantized Hall Effect
      • Can the U.S. Trust the U.S.S.R.?
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