At least two of the big movies coming out in 2009 involve time-travel, so it's a good time to review what we know and don't know about the possibility of the real time-travel to the past. Two informative and easy to understand links are
Time Travel and Modern Physics and
Rules for Time Travelers.
By the way, we are all traveling through time in the forward direction, so the only unknown time travel is time traveling to the past.
I think the movies
Time Crimes (
Los cronocrímenes) and
Primer are probably closest to the real time travel if it is indeed possible.
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