One of the oldest thought experiments to exist is the Ship  of Theseus, it questions whether an item stays the same even if every part is changed... sounds boring to some, but what if we weren't talking about a ship? What if we were talking about you? At what point are you no longer you?

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Sources
https://www.snopes.com/fact-check/does-body-replace-itself-seven-years/

https://www.nature.com/articles/nature.2017.22321

http://book.bionumbers.org/how-quickly-do-different-cells-in-the-body-replace-themselves/

https://www.businessinsider.com/how-long-it-takes-the-body-to-grow-hair-nails-cells-2018-4

https://www.sciencedaily.com/releases/2020/05/200507131311.htm

https://en.wikipedia.org/wiki/Ship_of_Theseus

https://www.medicalnewstoday.com/articles/hyperthymesia

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