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How exactly does the Novikov theory "prevent" an event from occurring in the past? That's another thing I've always found weird about time travel dealing with paradoxes, is how exactly the universe prevents a paradox from taking place?
There are things that a time traveler could do to prevent the titanic form sinking, or at least change the history of that episode. He could transport of a hundred of his friends all dressed out in futuristic gear on board the titanic, walk up to the captain while exposing himself to the entire crew, and have all his friends sing a musical number about the fate of the Titanic, and when it will happen.
When someone tries to do this, does the universe manifest in the form of Yotsuba, and kick them all in the nades before they can depart to the past?
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