A new model for looking at time travel in essence prevents it from happening at all.
In other words, even if you take a trip back in time with the specific intention of killing your father, so long as you know he is happily sitting in his chair when you leave him in the present, you can be sure that something will prevent you from murdering him in the past. It is as if it has already happened.
Very interesting article. It's been debated about for a long time. What do you guys think?