Stephen Hawking's recent book The Grand Design uses M-theory to predict a multiverse, which then does away God via the anthropic principle. A common criticism that string theory makes no experimentally falsifiable predictions which is countered that experiments do not have enough energy to probe the Planck energy. The highly beautiful symmetry of strings is broken, and this symmetry breaking is why it cannot make definitive falsifiable predictions at, say, LHC energies. While particle accelerators do not exist, we do have the Big Bang. Big Bang had planck scale energies in the planck era. Does string/M-theory offer falsifiable predictions? In Grand Design Hawking outlines M-theory A model is a good model if it: 1. Is elegant 2. Contains few arbitrary or adjustable elements 3. Agrees with and explains all existing observations 4. Makes detailed predictions about future observations that can disprove or falsify the model if they are not borne out. What exactly does M-theory say about the Big Bang and Planck scale physics? I understand that M-theory’s beautiful symmetry visible on the Planck scale must be broken at lower scale. Do cosmologists use M-theory to model Planck-scale Big Bang? What does M-theory say about the Planck era where GR becomes a singularity? Does M-theory do what Hawking wants it to do, makes a falsifiable prediction of a multiverse, where other universes have different values of fundamental constants? What does M-theory tell us was the physics of the Big Bang in this energy scale? Can we take an M-theory prediction of planck scale physics in the Big Bang era, follow it forward in time into the future until it re-reproduces current Big Bang CDM model? How do the predictions of M-theory differ or similar to Loop quantum cosmology?