Combining Texts

You have chosen 'Letters to Edward Stillingfleet' by John Locke, 'The Actual and the Possible' by Alexander R. Pruss and 'On the Nature of Mathematical Reasoning' by Henri Poincar

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