(I am not a string theorist.) String theory makes plenty of testable predictions, they just aren't new so it has to compete with Quantum Mechanics. It gets in

(I am not a string theorist.) String theory makes plenty of testable predictions, they just aren't new so it has to compete with Quantum Mechanics. It gets into questions of how to choose between multiple theories that make the same predictions. For more info, Leonard Susskind (one of the theory's founders) has a lecture series on it here: http://theoreticalminimum.com/courses/string-theory/2010/fall http://theoreticalminimum.com/courses/string-theory/2010/fal... I haven't watched them but they're likely to involve upper level undergrad or graduate level math.