Combining Texts

You have chosen 'The Evolution of Modern Metaphysics' by A.W. Moore, 'On the Conservation of Force' by Hermann von Helmholtz and 'The Ages of the World' by Friedrich Schelling

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All the ideas for Natural Reality, or select a subheading:
      A. Classical Physics
      B. Modern Physics
      C. Space
      D. Time
      E. Cosmology
      F. Chemistry
      G. Biology