I don't quite know what he's arguing against. The E that's mc^2 has always been the rest-mass energy. Hence what Doug wrote for the total energy E^2 = m^2 c^4

I don't quite know what he's arguing against. The E that's mc^2 has always been the rest-mass energy. Hence what Doug wrote for the total energy E^2 = m^2 c^4 + p^2 c^2 I'm not saying the article is wrong, but he sure could have explained more clearly what wrongheaded thing he's trying to debunk because I didn't get it. It sounded kind of like railing that E=mgh is "wrong" because it should be E=mgh+mv^2.