Mmmph. Time is not 'the' fourth dimension. Time travel is easily possible - we're all doing it. Right now. Marching off into the unknown future. We can even control it, to a degree, by approaching the speed of light. If we were all two dimensional (and not just in personalities) we'd still be travelling through time.
If memory serves me, the most common description is that our universe has 3 spatial dimensions, and one time dimension. The 4D universe would have 4 spatial dimensions, but still one time.
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"'There's a tendency among the press to attribute the creation of a game to a single person,' says Warren Spector, creator of Thief and Deus Ex."
-- From an IGN game review.
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