Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'Presidential Address of Am. Math. Soc' by Oswald Veblen and 'Dialogues Concerning Natural Religion' by David Hume

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All the ideas for Natural Reality, or select a subheading:
      A. Classical Physics
      B. Modern Physics
      C. Space
      D. Time
      E. Cosmology
      F. Chemistry
      G. Biology