From: arl_123234@hotmail.com   
      
   Hello, all.  One concept that I can seem to get my thoughts around is   
   that arguably gravitational force fits in to the Newtonian concept of a   
   force that can act on a mass.  But general relativity informs us that   
   gravity isn't a force at all but a phenomenon due to the curvature of   
   space-time.  How can merely the curvature of space give rise to the fact   
   that two untethered masses will tend to be attracted to and move toward   
   one another?  We've seen those rubber-sheet demos but they rely on   
   earth's gravity and we end up with a cause-effect-cause situation?   
   Thanks for your time and comment.  Sincerely   
   --   
   J. B. Wood	            e-mail: arl_123234@hotmail.com   
      
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