Combining Texts

You have chosen 'New Scientist articles' by New Scientist writers, 'Causation and the Flow of Energy' by David Fair and 'The Inference to the Best Explanation' by Gilbert Harman

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge