It seems if this article is factually correct then it is possible to travel forward in time by travelling at light speed away from earth, and then travelling back at light speed. I know that NASA have ideas on how to build a warp engine, but for now we have no fuel to power it. As soon as the fuel (exotic material) is discovered to power such a engine time travel will be possible but only forwards, i reckon travelling backwards in time is impossible.
http://thespiritscience.net/2014/05/27/new-understanding-of-time-changes-the-way-we-see-the-world/
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