From: ram@zedat.fu-berlin.de   
      
   "J.B. Wood"  writes:   
   >Hello, and so what we conclude is curved space-time is indistinguishable   
   >from gravity.  They're both manifestations of the same phenomenon (some   
   >as yet-to-be-discovered property of the cosmos?) Kind of like talking   
   >about "matter/mass" and "energy" separately when we know E = MC^2.   
      
     There /is/ a difference between energy and mass because   
     E=mc^2 is only a simplification. In fact, E^2 is (mc^2)^2   
     /plus/ (pc)^2. In other words, kinetic energy is not mass.   
      
     (However, some kind of movement can become part of the mass:   
     a heated gas with total momentum 0 has more mass than the   
     same gas cooled down and still with total momentum 0.)   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)