I listened to Lee Smolin's compelling case against string theory in NPR and i do agree with him. What bothers me about string theory is this rather religious belief in the postulate that "mathematics = physics". The notion that if theorists are able to come up with a set of equations- consistent and elegant and fit observations in a finite set of points, then it must be "true". That if mathematics requires 11-dimensions, then universe also should have 11 dimensions. Never mind the fact that mathematics uses infinitesimal calculus which requires infinite number of points to observe(as dx->0, Number of points->infinity) to make any "true" statement about Nature. -Akhila Raman