Moving forward is relatively simple. Just travel at great speeds. You start to see significant time dilation at a quarter the speed of light, which can be attained simply by mastering the use of antimatter as fuel. A technology which is probably no more than 25-50 years away.

Moving backward in time will require technologies we can't even imagine yet. We don't even know how time works, exactly. We're going to have to know a lot more about physics before we can even make an educated guess as to whether backward time travel is possible.

However, back to the information thing, I'm pretty sure there was an experiment that has been duplicated that involved sending information back about five minutes. That could be the mother of all military advantages if we can make it work. Imagine a patrol in Iraq gets ambushed. After it's over and a few of our soldiers are KIA, we just send a message back 15 minutes to the same squad since now we know exactly where the insurgents are. THey ambush the ambushers.

It would also be a good test of paradox to see how that kind of thing would work. And it's an experiment we might be able to try within a matter of years.

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