:Actually, the idea of a "grand unified theory" didn't arise until about the 1950's, give or take a couple of decades. Einstein's formula was published in 1905.<ref>[http://www.fourmilab.ch/etexts/einstein/E_mc2/www/ "Does the Inertia of a Body Depend its Energy Content?" Albert Einstein, Sept 1905]</ref> The formula has nothing to do with gravity, and the canard of "mass-energy equivalence" is really a meaningless notion. The equation simply says that potential energy has mass; nothing more. | :Actually, the idea of a "grand unified theory" didn't arise until about the 1950's, give or take a couple of decades. Einstein's formula was published in 1905.<ref>[http://www.fourmilab.ch/etexts/einstein/E_mc2/www/ "Does the Inertia of a Body Depend its Energy Content?" Albert Einstein, Sept 1905]</ref> The formula has nothing to do with gravity, and the canard of "mass-energy equivalence" is really a meaningless notion. The equation simply says that potential energy has mass; nothing more. |