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The question is if you could change little things about yourself over time, would you still be you? This is a question of identity, how much can we change and still remain ourselves?

Think about it this way: if you could use something like CRISPR to slightly alter your genes, maybe grow scales or gills, would those cumulative changes eventually turn you into someone else entirely?

Or consider this: what if you started replacing body parts with prosthetics – an arm, then a heart, and so on, until your whole body was artificial and completely different. At what point would you cross that line from you to something new?