When travelling, there are three dimensions to travel through - up and down, side to side, forward and backwards. But let us suppose time is the fourth dimension, as most scientists agree. We already know it is possible to go forward in time, into the future. We are constantly travelling forward. But could it also be possible to turn around and go back in time? Or even further forward, into the future? Time travel is pretty fascinating stuff and opens up a whole Pandora's Box of paradoxes, alternate universes and non-linear cause and effect. In other words, kill your own grandfather and there's no telling what'll happen. Kill the ancestor of the human race, you're screwed. On the other hand, changing history could create alternate universes based on quantum mechanics. It's very complicated, and I'll stop my musing right here to avoid blowing any minds. To get to the point, this is where stories involving time travel go. Well, allons-y!

Dr Who

I just couldn't resist ;D

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