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Time travel makes for great science fiction stories (going back to H.G. Wells's 1895 novella, The Time Machine), but no one knows how to actually achieve it, and there are some good arguments for why it's logically impossible. For example, if it were possible for you to go back in time, you could, in principle, kill your parents before you were born; and then how could you currently exist?
Of course, you do travel into the future -- at the rate of 24 hours every day! :)
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