Combining Texts

You have chosen 'The Problem of the Essential Indexical' by John Perry, 'The Trouble with Possible Worlds' by William Lycan and 'Moral Dilemmas Revisited' by Philippa Foot

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