Combining Texts

You have chosen 'The Principles of Chemistry' by Dmitri Mendeleev, 'The Logic of Scientific Discovery' by Karl Popper and 'Interview with Baggini and Stangroom' by Simon Critchley

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All the ideas for Modality, or select a subheading:
      A. Necessity
      B. Possibility
      C. Sources of Modality
      D. Knowledge of Modality
      E. Possible worlds