You really shouldn't be asking this question. I think that it is wonderful that you have peaked an interest in physics from national TV programing, however, theories such as string theory and really any principles of physics, proven or not, can not be understood to any degree with a television and a question on a forum. I am by no means trying to stifle your interest. I am only suggesting that if you are truly fascinated and want to gain a deeper understanding of the universe, you must start with the basics.
It is like attempting to read musical notation, when all you know how to do is read guitar tabs.
The foundations of knowledge must be in place if you want to truly KNOW something as far out as string theory, or as seemingly simple as Newtonian physics.
But anyway here's a link to get you started so you don't have to wait 15 or 20 years:http://www.superstringtheory.com/"