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      Knowledge is Power

      Scientific American June 08, 1912

      What is the Principle of Relativity?

      • By W. J. Humphreys on June 8, 1912

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      More in the June 08, 1912 issue of Scientific American
      • Correspondence - June 8, 1912
      • Radiographic Study of the Effect of Exercise on the Heart, Exercising in Bed, Ripening Dates Artificially and more
      • What Inventors are Doing
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