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      Knowledge is Power

      Scientific American July 10, 1909

      The Fourth Dimension Simply Explained

      The First Honorable Mention Essay in the Fourth Dimension Competition

      • July 10, 1909

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      More in the July 10, 1909 issue of Scientific American
      • Drydocks for our Biggest Battleships
      • New Books, Etc. - July 10, 1909
      • The Directive Sense of Bees
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