Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'Reason, Emotions and Good Life' by John Cottingham and 'Building Blocks of Mathematical Logic' by Moses Schnfinkel

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature