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      Knowledge is Power

      Scientific American June 23, 1894

      How to live and retain Health and Vigor in Old Age

      • By Nicolas Pike on June 23, 1894

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      More in the June 23, 1894 issue of Scientific American
      • An Amateur's Photographic Laboratory
      • Note on an Apparatus for the Continuous Production of Nitric Acid
      • The Latest Egyptian Discoveries
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