Combining Texts

You have chosen 'The Character of Physical Law' by Richard P. Feynman, 'The Emperor's New 'Knows'' by Kent Bach and 'Two letters on mind' by Ren Descartes

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature