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I haven't got a copy of Hawking's new book yet ('The Grand Design'), hoping I'll get it as a Christmas present . But i was quickly thumbing through it (mosly the side flaps) at the bookstore yesterday, and Hawking seems to subscribe to the 'Sum of Histories' theory (?), where the Universe must take on every possible outcome (as in the quantum photon taking on every possible path to reach its 'destination', as in the double split experiment), implying the existence of an infinite number of universes (in reality, or mathematically speaking?). If this is correct, how does this theory differ from M-Theory with its multiple (infinite?) number of 'multiverses' ?