The Advantages and Disadvantages of 12 Monkey Style

Theory where you go back in time and make changes and they're reflected when you get back to the future. Star Trek is using this one a lot, but we're going to name it after Doc from Doc Brown because he explains this theory in the back to thefuture movies. And then there's the theory of 'the sound of thunder thunder' which comes from famous short story about guy who steps on butterfly and dies short times.