Combining Texts

You have chosen 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo, 'Meditations' by Ren Descartes and 'Mad Pain and Martian Pain' by David Lewis

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