Combining Texts

You have chosen 'The Character of Physical Law' by Richard P. Feynman, 'On the Notion of Cause' by Bertrand Russell and 'works' by Lord Kelvin (Wm Thomson)

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction