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Grandather paradox exists only if you look at time as a 2D line, which it isn't. It's more like multi-layered std::vector of data, existing "all at once", where content of one cell is calculated based on the content of the previous one "all the time". Change a value in the past by inserting another value, following data pockets will update, but the inserted thing will remain.
– Petersaber
Commented Jun 30, 2015 at 7:06

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