Regarding "The Elegant Universe", page 48-50: Relativity says that all objects have a velocity of c. For most objects most of this velocity is in the time dimension. For light, none of this velocity is in the time dimension but one of the other 3 (x,y,z). For an object to give all of this "dimensional energy" to just 1 dimension means the object will have a velocity of c in that dimension. Now enter String Theory, which says there are 10 dimensions. A string requires the additional 6 dimensions in order to resonate correctly (to output a photon for example). Here's the problem: If a string has to vibrate in the additional 6 dimensions, then some of its energy is being expended in those dimensions. Meaning that a photon cannot give all its energy to just 1 dimension (ie, straight forward, the x dimension). That means that a photon cannot travel the speed of light in x, y, or z because of the energy expended in the "other 6" dimensions... Where am I going wrong here? Light has to move at c!