Combining Texts

You have chosen 'How Things Might Have Been' by Penelope Mackie, 'Abstract Objects: a Case Study' by Stephen Yablo and 'Causal Powers' by Harr,R./Madden,E.H.

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