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      Knowledge is Power

      Scientific American January 30, 1915

      Do You See the Point?

      • By Leonard Keene Hirshberg on January 30, 1915

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      More in the January 30, 1915 issue of Scientific American
      • Mankind in the Making
      • New Books, Etc. - January 30, 1915
      • The Photo-Kaleidograph
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