From: fortunati.luigi@gmail.com   
      
   In the formula F=ma force is related to acceleration.   
      
   If acceleration exists in all references, the force is real, otherwise,   
   if it exists in one reference and "disappears" in the other, then the   
   force is "apparent".   
      
   On the other hand, in the formula F=m1*m2/d^2 there is NO acceleration   
   and this is the difference between the second formula and the previous   
   one.   
      
   In F=m1*m2/d^2 the force depends exclusively on the presence of the two   
   masses m1 and m2 (which always exist) and on the square of their   
   distance (which always exists).   
      
   Therefore, if the masses m1 and m2 and the distance d^2 never disappear   
   (in any reference) the force F=m1*m2/d^2 is always real.   
      
   And what is the force F=m1*m2/d^2? It's gravity.   
      
   So gravity is not "apparent" because (the formula says so and not me)   
   its force does not disappear by changing the SDR.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)