Time Travel

How I view Time Travel, and the grandfather paradox : I go back in time and "mess" with my ancestors, thereby destroying my own time-line. Think of time as a cellular automaton, or a Wolfram process: areas of regularity and areas of chaos:

Areas A, B, and C are areas of regularity.

I inhabit area B. I may, therefore, go back in time to A, since it does not form part of my "history". I am prohibited from going back to C, however.

What prohibits me? I think we shall find "laws" of regularity in chaos. Maybe "habits" of regularity.

Now some people say we are all descended from some primeval Eve, like "Lucy". Well, that may explain why - if time travel is possible - you see no evidences of time travel. Surely our descendants would be buzzing around bothering us, wouldn't they? But they aren't. This may be due to the "Lucy" effect, and a deeper regularity underlying apparent chaos.