Combining Texts

You have chosen 'Letters to Antoine Arnauld' by René Descartes, 'Ancient Thought in Modern Physics' by Werner Heisenberg and 'What Does It All Mean?' by Thomas Nagel

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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