Will We Travel Back (Or Forward) In Time?

Einstein proved we can travel forward by moving near light speed. Backward requires a wormhole, cosmic string and a lot of luck

We can travel through the three dimensions of space pretty much at will--moving forward or back, left or right, up or down--without even thinking about it. When it comes to the fourth dimension, though, we appear to be stuck. Time flows on in one direction only, and we flow with it like corks bobbing helplessly in a river. So the idea of traveling through time, as opposed to with time, is immensely seductive. Who wouldn't want to know what technology will look like in the year 3000, or witness the assassination of Julius Caesar?

Not only does such a thing seem...

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