Combining Texts

You have chosen 'Reply to Fourth Objections' by René Descartes, 'Elements of Law and Justice' by Gottfried Leibniz and 'The General Theory of Employment' by Maynard Keynes

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All the ideas for Science, or select a subheading:
      A. Basis of Science
      B. Scientific Theories
      C. Induction
      D. Explanation