Combining Texts

You have chosen 'Infinity: Quest to Think the Unthinkable' by Brian Clegg, 'Change in View: Principles of Reasoning' by Gilbert Harman and 'True in Theory, but not in Practice' by Immanuel Kant

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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