Combining Texts

You have chosen 'A Discourse on Method' by René Descartes, 'Mathematics without Numbers' by Geoffrey Hellman and 'Principles of Nature and Grace based on Reason' by Gottfried Leibniz

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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