Combining Texts

You have chosen 'The Value of Science' by Henri Poincaré, 'Letters to Samuel Masson' by Gottfried Leibniz and 'On the Law of War and Peace' by Hugo Grotius

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