If time travel is possible, what would be the first thing that you would do if you could travel either to the past or to the future and back. Wouldn't you want to save the lives of the ones that you love? How would this disrupt events in your present day?
I still hope the construction of a stargate or time travel machine to be not impossible but I'm not so sure about what the consequences will be. A much awaited dream of a unified theory of quantum mechanics and gravitation will be able to help us explain the process in a long way.
