Combining Texts

You have chosen 'Mathematics without Numbers' by Geoffrey Hellman, 'A Defense of Abortion' by Judith (Jarvis) Thomson and 'On Copernicanism and Relativity of Motion' by Gottfried Leibniz

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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