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When will time travel be possible? Ask USA TODAY

Will time travel ever be possible? According to science reporter Dan Vergano, not likely. Although several physicists have theories. See more in this video response to the reader question. Send us your questions using #askusatoday on Twitter.

http://www.wbir.com/video/2695748230001/1/When-will-time-travel-be-possible-Ask-USA-TODAY http://videos.usatoday.net/Brightcove2/29906170001/2013/09/29906170001_2695658062001_EINSTEIN120.jpg?pubId=29906170001 When will time travel be possible? Ask USA TODAY Will time travel ever be possible? According to science reporter Dan Vergano, not likely. Although several physicists have theories. See more in this video response to the reader question. Send us your questions using #askusatoday on Twitter. time machinetime travelphysicsEditorial pagestephen hawkingAlbert EinsteinAsk USA TODAYscience 01:56

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