The fantasy of "Time Travel". The discussion of time travel into the past is science fiction at its best. To think there is any way to stop the flow of the universe into the future, then make it flow in reverse just for human amusement, is fantasible. How can one travel back in time to a past that no longer exists. The Universe that existed when I started this post has changed 100% into what has past once more. There is no past except in memory. E=mc^2 is in constant flow and is only futuristic in nature. For those in science, the "uncertainty principle" shows that all matter is fleeting in nature and never distinct. Time travel into the future is possible through the changing of perspective, by speed, with no past to return to. There is only a flow into the future. There is no now, only future, so how can one travel back to something that is only passing in nature and never distinct in being.