XPost: sci.physics   
   From: ram@zedat.fu-berlin.de   
      
   Phil Hobbs  wrote or quoted:   
   >Doesn’t work though—the energy has mass too.   
      
     Energy does not always have mass. Counterexample:   
     A photon - it has energy, but no mass.   
      
   Newsgroups: sci.electronics.design,sci.physics   
   Followup-To: sci.physics   
   Subject changed   
      
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