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      Knowledge is Power

      Scientific American May 1915

      The Evolution of the Etrich “Taube”

      How a Seed-pod Was Developed into an Aeroplane

      • May 1, 1915

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      More in the May 1915 issue of Scientific American
      • Atoms and Ions—I
      • Temperature Coefficient of Magnetic Permeability within the Working Range
      • The Motor Truck in Modern Military Service
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