Combining Texts

You have chosen 'The Character of Physical Law' by Richard P. Feynman, 'On the Notion of Cause' by Bertrand Russell and 'Letter to Clerk Maxwell' by Richard Breheny

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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