Combining Texts

You have chosen 'Tusculan Disputations' by M. Tullius Cicero, 'What are Sets and What are they For?' by Oliver,A/Smiley,T and 'Protagoras' by Plato

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