Time travel is theoretically, possible, and all you would have to do is travel really, really fast -at almost the speed of light. At these speeds, your personal time would slow down relative to everything else and you would effectively go forward in time.
Unfortunately, it seems that this only works in one direction, and you can only go forwards, and not backwards. Which is helpful, as it sorts out all the paradoxes like why we haven’t seen anyone from the future, or what if you went back and killed your grandmother.
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