Because I was correlating the statement in the referenced post that mentioned the temperature of the CBR. Having temperature infers motion or kenetic energy. Unless you are really interested I'll not expound on that here. It is a subject in-of-itself but it corresponds with what is called the RCM Theory. http://renshaw.teleinc.com/papers/german1/german1.doc Antimated illustrations of functions of Relativity and RCM along with test proposals. http://renshaw.teleinc.com/ The motions of molecules may (and are ) frequently linked to temperature. I think the problem is one of being far to idealistic when trying to have a casual discussion that is to include lay persons. But that is a personal choice of style.