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I feel that time travel, into the past anyway, is impossible because of the dual linear/non-linear nature of time. If one were to travel back in time to assassinate Hitler, for instance, the very act of the assassination would render his impetus null. More plainly, if you could assassinate hitler, you wouldn't need to because you would have already done it. Therefore, it would be impossible to travel back in time, you would simply cease to exist. Also, I feel that time is really a more man-made system than anything, in that there is no other way to define time than by its passage. Who is to say that anything operates within the human boundaries of time? Without man, it would still operate, and perhaps the universe is in a constant state of forward and reverse jumps, and we go on simply unaware of it. Perhaps the universe operates on the principle of 2 millenia forward, one millenia back (also a human analogy, oh well). Short answer, our ignorance prevents this knowledge from being obtained as of now.
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