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      Knowledge is Power

      Scientific American December 1922

      Life-Belts and Near-Life-Belts--A Study of Government Regulation and an Invention, A Police Baton Furnished with a Flashlight

      • December 1, 1922

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      More in the December 1922 issue of Scientific American
      • A Square Deal for the Psychics
      • Blasting a Channel Through a River's Rocky Bottom
      • Fog Signaling by Polarized Sound
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