Who said biological immortality (do you mean a complete cure for ageing?) requires nanobots?
We know individual cell lines can go on indefinitely, the challenge is to have an intelligent multicellular organism that can too.
Cell line being immortal doesn’t prove that immortal brain is possible any more than microbe strain being immortal.
(Thanks to the Hayflick limit, only some lines can go on indefinitely.)
Who said biological immortality (do you mean a complete cure for ageing?) requires nanobots?
We know individual cell lines can go on indefinitely, the challenge is to have an intelligent multicellular organism that can too.
Cell line being immortal doesn’t prove that immortal brain is possible any more than microbe strain being immortal.
(Thanks to the Hayflick limit, only some lines can go on indefinitely.)