• Scientists have already concluded that backward time travel is scientifically impossible. (See http://www.livescience.com/1339-travel-time-scientists.html if you're curious.) But if you think about, anybody can come to the conclusion that backward time travel is logically self-eliminating. Right now time works like a one-way street: the past influences the future, and that’s all. But if someone were to open a portal between the future and the past, it would be a two-way street. The past and future would be constantly changing one another. Some dude goes back in time, messes up the past; he ceases to be because the future has been changed; another guy from the new future messes up the past in a new way. Time would be constantly changing itself until the future was changed in such a way that the time machine was never invented and never would be invented. Only then could the loop be broken, and time would be a one-way street again. The thing is, this is not a temporal phase or anything like that. It doesn’t start and stop. If backward time travel were invented at any point, the entire past would be changed, since one of the first things people would do would be to go back to prehistoric times to figure that out. So, hypothetically speaking, if backward time travel were not a scientific impossibility, the time machine WOULD exist. Somebody WOULD have invented it at some point down the line. The future would be changing all the time in correspondence with the past and the snowball effect until the point where the time machine never was. Therefore, if the time machine exists, it does not exist. It self-destructs.

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