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Ah, string theory. Now this is one that is supported by no evidence whatsoever. Hey, lets ramp up the number of dimensions to 10 or even 20 and look at how many extra degrees of freedom we have to play with. You can describe anything with a theory like that. You also get all these extra dimensions that you have to find a nifty was to close up again to remove those extra degrees of freedom to what we observe.
There is definately no experimental evidence for anything other than four space-time dimensions. To me this contradicts string theory immediately.
There is a very useful process in science called Occam's Razor. Anything supurfluous goes and the simplest explanation is what stands the test of time. When string theory started it was thought to be a simple explanation of what seemed like a very complicated situation. After a few decades of work on it it seems like a very complicated solution in deed.
To me the current obsession with string theory is one of the major reasons that fundamental physics hasn't made much progress in recent decades.
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