Combining Texts

You have chosen 'Survival and Identity, with postscript' by David Lewis, 'The Gay (Joyful) Science' by Friedrich Nietzsche and 'Thinking About Mechanisms' by Machamer,P/Darden,L/Craver,C

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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