If time travel were ever mastered, might it be possible to change the past in

If time travel were ever mastered, might it be possible to change the past in

If time travel were ever mastered, might it be possible to change the past in manners which wouldn't create paradoxes? Or are all possible changes inherently paradoxical? Also, if the past were successfully changed, is it possible that all of history would change, and we would have no recollection of the original timeline? Or is this idea inherently flawed? Thanks.

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