[dleviwing]

Since Feynman also stated we do not have a satisfactory explanation as to the cause of mass that promoting a theory of antimass is rather futile; also mass is a quantitative measure of something; the question should be a measurement of what? We actually do not have a true quantitative measure of physical substance; only relative interactive forces.

How were you introduced to such stuff? I do hope it wasn’t academia! Do you have a link? If it's Eric Peterson's theory, it's crap.