Combining Texts

You have chosen 'Intro to G��del's Theorems' by Peter Smith, 'On the spiritual perfection of life' by Thomas Aquinas and 'Introduction of 'Essence of Christianity'' by Ludwig Feuerbach

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