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      Knowledge is Power

      Scientific American November 04, 1916

      Invisible Comets

      Derelicts of the Sky That Long Ago Vanished from Sight

      • By William H. Pickering on November 4, 1916

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      More in the November 04, 1916 issue of Scientific American
      • Destruction of Cockroaches
      • Light Railways in the Trenches
      • The Principle of Relativity
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