It was a unified theory, and Einstein approved (note, this was pre-weak and strong force so it was a unification of gravity and electro-magnetism only). It was eventually disproven, but the math serves as the basis for higher dimensional theories (i.e. string theory)
How was it disproven (I see the erroneous electron mass part)? I suppose I am interested in the quantum field theory section of the wiki, which is unwritten.
It is my understanding EM is more or less directly relatable to more fundamental forces (or rather derived from it) so even being able to fit EM in it means that the others must fit.
