I don't remember much of Deja Vu.
Eccles_the_Mighty wrote:
Saw it, I felt like I'd seen the film before somewhere
Time travel is impossible. Lots of things get in the way including Einstein's familiar E=MC^2 (it takes staggering amounts of energy) and Heisenberg's Uncertainty Principle which covers the movement of particles and their direction.
Having said that, I have a bookshelf of SF books that include numerous time travel stories and I still enjoy them.
Supposedly there are certain subatomic particles that do it all the time.
This is the best time travel novel I've read. The author gets around a lot of the issues of time travel by the use of parallel universes.