Negligible senescence in mammals: if a shark can live to be 500 years old, so could we. (Senescence is probably an adaptation to fixed size habitats, so individuals don't outcompete their offspring.) https://www.thetimes.co.uk/article/scientists-examine-fishy-tale-of-centuries-old-shark-w56gtjfh2?shareToken=cd6976852a34fff7873786f8ecd20773 …
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look, every female can rebuild young human from scratch inside her body. just extract that code and make it work on your own body, ok. it's not a rocket science, lol )
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The hydra turritopsis does that: it can revert to a stage where the cells lose differentiation, and rebuilds. But you'd lose all of your memories.
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