"Rob said - "Do I believe that anything has zero mass or that nothingness exists ANYWHERE?"

REP: Are you talking about rest mass or momentum.

When you say mass, do you use the above two terms interchangeably?

Aren't Photons & Guage Bosons massless?"

Sorry, I momentarily forgot what DA had told me about mass. What I meant when I said it was that nothing can be said to exist unless it has a weight. I do not mean the force weight, I mean weight as in grams etc. Sorry for not knowing all the technical terms for stuff.