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**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!**