Combining Texts

You have chosen 'Scientific Explanation' by R.B. Braithwaite, 'The Origin of the Species' by Charles Darwin and 'True in Theory, but not in Practice' by Immanuel Kant

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories