Combining Texts

You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'Clarification and Defense of Grounding' by Paul Audi and 'Why the Universe Exists' by New Scientist writers

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