Combining Texts

You have chosen 'Change in View: Principles of Reasoning' by Gilbert Harman, 'The Fourth Revolution' by Micklethwait,J/Wooldridge,A and 'Letters to Russell' by Gottlob Frege

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All the ideas for Knowledge Aims, or select a subheading:
      A. Knowledge
      B. Certain Knowledge
      C. Knowing Reality