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      Knowledge is Power

      Scientific American July 30, 1921

      On the Trail of News, Doing Instead of Talking, The Paradox of Civilization

      • July 30, 1921

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      More in the July 30, 1921 issue of Scientific American
      • Home Building Simplified
      • Transporting Electric Current
      • Inventions New and Interesting - July 30, 1921
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