I was just wondering what string theory says, if anything, about mass energy equivalence...anyone have any insights....?? For example, I was wondering if there are mathematics formulated that can transform, say, an electron form of vibration into a massless energy vibration form....or how an energy string might be transformed into matter. While relativity doesn't say what space is, string theory offers a possible space construct as string forms...maybe in the form of branes....maybe as a one dimensional string sweeping out a two dimensional form in spacetime....so I'm wondering if string theory might have other insights on relativity. low and behold I did not find a string theory section here...under what heading are string theory questions discussed??