Here....this may help. A quick excerpt from the linked page:
One of the most remarkable predictions of String Theory is that space-time has ten dimensions! At first sight, this may be seen as a reason to dismiss the theory altogether, as we obviously have only three dimensions of space and one of time. However, if we assume that six of these dimensions are curled up very tightly, then we may never be aware of their existence. Furthermore, having these so-called compact dimensions is very beneficial if String Theory is to describe a Theory of Everything. The idea is that degrees of freedom like the electric charge of an electron will then arise simply as motion in the extra compact directions! The principle that compact dimensions may lead to unifying theories is not new, but dates from the 1920's, since the theory of Kaluza and Klein. In a sense, String Theory is the ultimate Kaluza-Klein theory.
For simplicity, it is usually assumed that the extra dimensions are wrapped up on six circles. For realistic results they are treated as being wrapped up on mathematical elaborations known as Calabi-Yau Manifolds and Orbifolds.
http://www.damtp.cam.ac.uk/user/gr/p...s.html#mtheory
The Ideas and theories surrounding M- theory/String theory are hypothetical constructs used to explain observations and mathemetical variances from relativity theory. As with all science, they are not fact, and never claim to be such. But as a work in progress there are intersting correlations between the observable, and the theoretical.