Let’s say we left one single very smart guy (not necessarily with the knowledge: they may be able to understand hard stuff when taught it, but not know it already) alone on a copy of the earth. That person is also immortal. Could that person, by themselves, gain back all knowledge, maybe also experimental, or even surpass that is already available to us right now, before the planet gets inevitably engulfed by a sun turning red giant?
I think it’s possible given an infinite amount of time that they could recreate any previous human technology, but would they want to?
It might get kind of boring spending every day for thousands of years just trying to recreate old technology.
Are they the last person on earth? If so I can’t see anyone wasting too much time building tech meant to assist people who don’t exist anymore.
I guess what I’m saying is it’s pretty certain they could do it, but only if there were some motivation like saving humanity after an apocalypse
just boredom I guess. what else are you gonna do for infinitely many years anyway?