Combining Texts

You have chosen 'Possible Worlds' by David Lewis, 'Sickness unto Death' by Sren Kierkegaard and 'Preface to 'Principles of Philosophy'' by Ren Descartes

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