"Suppose you go back in time and kill your grandparents before your father is born. Death; because your grandparents are dead, there will be no father; without your father, you would not be born; if you were not born, no one would kill your grandparents; if no one would kill your grandparents Die, you will exist and go back to the past and kill your grandparents.”
This is the famous grandfather paradox. There are two main explanations for this paradox: one is the parallel world theory, which means that when you Going back in time, you have come to another parallel world, and nothing you do in that world will affect the current world. (The grandfather of that world was killed by you, so that you of that world disappeared, but all this will not affect you of this world)
The second explanation is called the Novikov self-consistency principle, which means that we are the world that has passed The time traveler has changed, and when the time traveler wants to make more changes that are inconsistent with the real world, there must be some power to stop him. (For example, he couldn't kill his grandfather no matter what)
The grandfather's paradox that everyone understands also has loopholes. As the Twelve Monkeys movie said, the virus has spread. Some people say that Cole’s crossing failed to change the facts and trends of the virus spread, but the person Cole wanted to target at the airport became an assistant, and the mastermind of the virus incident was also Because the female doctor’s phone call and Cole’s influence changed from the twelve monkeys to the assistant, these changes were all due to the fact that the virus was spreading and could not be changed. So when Cole tried to stop it, it was time and space to find out. Let the assistant replace the twelve monkeys, just like the grandfather's paradox, there is a certain power that you can't kill your grandfather no matter what. In the movie, there is a certain power that will always make a person replace Pete (twelve monkeys) to complete the spread of the virus. But there is a very important point. The movie takes the spread of the virus as the only unchanging history. Based on this benchmark-the spread of the virus will not change, so Cole will continue to do things that were not in the original period of history after crossing, and will change that period of history, such as The assistant became the mastermind and appeared at the airport (originally Pete) but the benchmark-the virus will definitely spread and will not change. It's just a matter of finding a reference point. For that period of history, what if we regard the reference point as the airport being chased by Cole with a gun? In the first history, the man who was chased by Cole with a gun was Pete. Then Pete will be chased by Cole and it cannot be changed, that is, no matter what Cole does after crossing, there will be some power that prevents the assistant from coming to the airport, and Pete is the last person to come to the airport. This is similar to the grandfather's paradox, if you can't kill your grandfather in the end, even your grandmother blocks the bullet you drive towards your grandfather. But your grandmother's destiny has been changed in this period of history where your grandfather will never be killed by you. Just like the fate of that assistant, he wouldn't have appeared at the airport, (it was Pete), but because of Cole's crossing, the assistant appeared at the airport. Then there is a contradiction. Since it is all history, why some things in history always have some power to make it impossible to change (grandfather cannot be killed), but these things that cannot be changed are based on changing other things (grandmother blocks grandfather) Bullet, grandmother's fate was changed) based on. This time-travel thinking itself is a dead end. Many time-space movies have a point of view that travel will change the plot and details of the story, but the final overall picture depicted in the movie will never change. Isn't every event equivalent to a piece of history? All things have happened. The spread of the virus will not change, and the spreader of the virus will not change. Caused a change in the mastermind of the spread? This is a contradiction. In fact, every similar time-space movie just finds a reference point to determine that a certain fact will not change, while other details will change. Time and space will change other causal details before the ending in order to keep a certain ending unchanged. Another point about time travel, why travel to the past in the movie? To find the source of the 1990 virus in 2035? Then I want to ask that 2035 will pass. . . . Will the 2090 buddies suddenly cross into the experiments of the 2035 scientists who are studying viruses? In other words, if there is a crossing, will someone crossing over to us now? After all, we are here in their future past. In other words, if there is a crossing. . . In fact, our future already exists, and we can now call it a past. . . Unfortunately, no one has crossed to us now. . . . It is impossible not to be discovered, at least if I can pass through when I live, I will definitely pass through to the present. . . But I found no sign of my crossing in the future. . . .
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