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Originally posted by: ADigitalMan
Who was it that said "If time travel is possible, why haven't people arrived from the future to tell us so?"
Because according to quantum phisics, one can only go back in time as far as the time machine was built. The only possible way to time travel - and by possible I mean theorically - is to dive into a black hole, you would come out of the black hole in the past (never in the future), and never before the black hole was created.
Theorically it is possible to time travel, but practically it's impossible to do it.