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Stephen Hawking's closest collaborator offers the intellectual superstar's final thoughts on the cosmos - a dramatic revision of the theory he put forward in A Brief History of Time.. Perhaps the biggest question Stephen Hawking tried to answer in his extraordinary life was how the universe could have created conditions so perfectly hospitable to life. Pondering this mystery led Hawking to study the big bang origin of the universe, but his early work ran into a crisis when the math predicted many big bangs produce a multiverse, most of which would be far too bizarre to harbor life. . Holed up in the theoretical physics department at Cambridge, Stephen Hawking and his friend and collaborator Thomas Hertog worked shoulder to shoulder for twenty years, developing a new theory of the cosmos that could account for the emergence of life.