Combining Texts

You have chosen 'Intro to G��del's Theorems' by Peter Smith, 'There are no ordinary things' by Peter Unger and 'The Gathas (seventeen hymns)' by Zoroaster

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