I have exchanged emails with Dr. Kaku and attended several of his lectures. He is one person and does not represent the state of string theorists any more than the pope represents all of Christianity.

I respect his accomplishments and opinions. That does not mean I agree with all of them all of the time nor does it mean, far more importantly, that his colleagues agree with him: Many do not.

String theory, itself, is not fully testable in that we do not yet know how to test it. But some of its predictions are testable and will be tested as soon as possible.

DA Morgan