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      Knowledge is Power

      Scientific American July 17, 1909

      Radium in the Earth and its Effect

      Radio-Active Deposits and the Instability of the Crust

      • By John Joly on July 17, 1909

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      More in the July 17, 1909 issue of Scientific American
      • An Apparatus for Studying Friction
      • The Application of Nobili's Rings to Color Photography
      • The Origin of the Moon
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