Combining Texts

You have chosen 'The Foundations of Mathematics' by Frank P. Ramsey, 'On the Conservation of Force' by Hermann von Helmholtz and 'The Inference to the Best Explanation' by Gilbert Harman

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