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Alternate Realities and Parallel Dimensions

Delve into the sci-fi tropes that have become a part of our everyday vocabulary parallel worlds, other dimensions, the multiverse, and more.These words didn't just appear from thin air. They're all grounded in actual ideas, and there are scientists out there trying to make them a reality. How close are we to finding another version of you and how many are there in existence? Would there be downsides? And are there any ethical conundrums that are created as a result? If only we could ask our other selves to be sure . . .