I think a lot of people often confuse string theory with the many world interpretation of quantum mechanics ( parallel universes). If string theory is found to be correct, that doesn't mean there are multiple universes. It just means it's possible. Here is a good article for explaining it to the layman: http://zidbits.com/2011/03/19/a-laymans-explanation-for-string-theory/

This post was edited by TrapperG on Mar 29 2011 07:34am

I don't give much credit to the string theory, since it doesn't have a way of testing it by experiment, denying the scientific method.

It might be the answer to our questions, but it's complexity and convolutedness suggest to me that it is either wrong or incomplete. We have simplified many of our earlier physical theories (IE light/electricity/magnetism to Maxwell's equations for the electromagnetic field, etc) and it may happen with string theory, but in it's current state it is too entangled to be a viable solution to our physical problems imo.