Just say no to the past
Brian Greene has looked at the ways people think time travel can happen and had declared Time Travel is impossible. This does not surprise me. To be honest I never believed in time travel. I could never down with the idea that we could move through time at our leisure. It is that old saying about time travel not existing because we are not awash in thousands of time travelers from the future. On top of that no one from the future showed up at the Time Travelers Convention. Those things happen only in comics.