The New Time TravelersThe story of physicists' quest to answer a mind boggling question: How can we travel through time? Since H. G. Wells's 1895 classic The Time Machine, readers of science fiction have puzzled over the paradoxes of time travel. What would happen if a time traveler tried to change history? Would some force or law of nature prevent him? Or would his action produce a "new" history, branching away from the original? In the last decade of the twentieth
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