Brian Greene gives the argument for superstring theory at TED. Including a brief chronological history of the search for the holy grail of science – a unified theory of everything. Gravity has always long been the black sheep of the family of fundamental forces of nature, the mathematics of superstring theory offers one of the few consistent theories which could possibly bring gravity back into the fold and takes us closer to a theory of everything.
Extra dimensions, vibrating strings are usually the point at which at even interested amateurs’ eyes start to gloss over but if you can stick with Greene’s illuminating train of thought, string theory emerges as a plausible line of inquiry at the cutting edge of our current knowledge.
Brian Greene’s Superstring Theory Tedtalk
Brian Greene’s official site can be found here: http://www.briangreene.org/
Superstring Theory: http://en.wikipedia.org/wiki/Superstring_theory
Theodor Kaluza: http://en.wikipedia.org/wiki/Theodor_Kaluza