Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Letters to Pierre Bayle' by Gottfried Leibniz and 'Letter to G.H. Schaller' by Baruch de Spinoza

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