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Time and the ability to travel in many directions in it is only limited in the human ability to understand how time is measure or how it "moves." Humans have been bound by the notion that time is linear. Einstein's theory of General Relativity provided that space and time are intertwined. We live, then, in a four dimensional world, which is all good and dandy if that's all we ever have grasp of with quantum mechanics. There is a slight problem here. When referring to a thing's "time" in a particular space using quantum measurements, we are in effect locating its quadrants relative to its specific time and physical measurements. This is human measurement and nothing more; our way of locating a particular event, such as John Kennedy's death or the eruption of Mt. St. Helen. We can travel back and forth between two physical space points, but we are bound by time moving "forward." Despite our ability to move back to our point of origin, we still arive at that point in a new "time." This leaves room for a theory that time and space are not intertwined; they exist freely of each other.

Quantum physics states that space may have 10 or 11 dimensions. All but three are unperceivable to humans and we can only have knowledge of the fourth, time. This reminds me of a presentation in the series "Cosmos" where Dr. Sagan demonstrates how a two dimensional world, invaded by a three dimensional object, only "see" the two dimensional part of the three dimensional object. They are limited in perception by their two dimensional reality. Dr. Roger Penrose states that although there are many dimensions, those outside of our own perception are "unstable" and therefore it is "natural" for these alternate universes to exist in only our one. The universe is only as we perceive it and this is again confining and it can be assumed that Dr. Sagan's demonstration may be more likely to exist in reality than the comfort of Dr. Penrose and his only one universe theory. Comfort, however, does not always make good science.

Time, as our fourth dimension, is something we can see but not move in any direction but one. To find that travel can be made throughout our other three dimensions yet time only marches in one direction is limiting. Science itself is continually being rethought; paradigm shifts in a new direction are constantly being made, yet the paradoxes created with the ability to travel time are so uncomfortable that the human mind is incapable of "wrapping itself"

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