I'd love to ask Andy this question: "You said that string theory is the only candidate theory which reconciles quantum mechanics and general relativity. However some would disagree. In particular one model, loop quantum gravity (or LQG) has had considerable success or so it's proponents claim. What would LQG need to be able to do in order to satisfy your criteria for a theory of quantum gravity? Or what does it do wrong due to which you feel it is not a viable theory of quantum gravity?"