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				Originally posted by Mantus  
If you want to move back in time then you would have to literally re-wind the movement of every bit of matter in the known universe.  An impossible prospect. 
			
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 Wrong.  To travel back in time, you'd just have to cover a distance in less time than light (in a vacuum) takes to cover the same distance.
Best way we've got of doing that at the moment is to figure out how to fall through a wormhole (they probably exist) without turning into spaghetti.
As for travelling forward in time...we're already doing that at a rate of one second per second.  If you want to go faster than that, hop on the concorde.  You'll pick up a very small fraction of a second on the rest of the world by the time you hit London.