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Scientists have long been fascinated by the idea of time travel, but what if it were possible? Would we be able to go back in time and change things in our past? This question has been a topic of discussion among scientists and laypeople alike for decades, but we’ve never been able to definitively say that we can or cannot do this because we’re stuck with what’s called the grandfather paradox—the infinite loop created by going back in time and killing your own grandfather before you are born.