Meh, another buzzword. I actually don't think we'll see nanosurgery for a very long time, and we should be able to solve the problem of "death" many generations of tech before we can do nano-surgery.
Think about what you actually need to do this. You need a small robot, composed of non-biological parts at the nanoscale. Presumably, this would be diamondoid components such as motors, gears, bearings, etc as well as internal power storage, propulsion, sensors, and so on. The reason for non-biological parts is that biological parts are too floppy and unpredictable and are too difficult to rationally engineer into a working machine.
Anyways, this machine is very precisely made, probably manufactured in a perfect vacuum at low temperatures. Putting it into a dirty liquid environment will require many generations of engineering past the first generation of nanomachinery that can only function in a perfect vacuum at low temperatures. And it has to deal with power and communication issues.
Now, how does this machine actually repair anything? Perhaps it can clean up plaques in the arteries, but how does it fix the faulty DNA in damaged skin cells that cause the skin to sag with age? How does it enter a living cell without damaging it? How does it operate inside a living cell without getting shoved around away from where it needs to be? How do it's sensors work in such a chaotic environment?
I'm not saying it can't be done. In fact, I am pretty sure it can be done. I'm saying that this is a VERY VERY hard engineering problem, one that would require inconceivable amounts of effort. Using modern techniques this problem may in fact be so complex to solve that even if we had the information about biology and the nanoscale needed to even start on this project, it might be infeasible with modern resources.
If you have these machines, you have a machine that can create other nanomachines, with atomically precise components. Your machine probably needs a vacuum and low temperatures, as before. Well, that machine can probably make variants of itself that are far simpler to design than a biologically compatible repair robot. Say a variant that instead of performing additive manufacturing at the nanoscale, it can tear down an existing object at the nanoscale and inform the control machinery about the pattern it finds.
Anyways, long story short : with a lot less effort, the same technology needed for nanosurgery to be possible could deconstruct preserved human brains and build computers powerful enough to simulate these brains accurately and at high speed. This solves the problem of "death" quite neatly : rather than trying to patch up your decaying mass of biological tissue with nanosurgery, you get yourself preserved and converted into a computer simulation that does not decay at all.
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I enjoyed reading the Temptation of Christ article. One thing that struck me is that the Jesus character responded far more reasonably than your typical deluded person does when asked questions which challenge their beliefs, at least in my experience.
In my experience, when a person's beliefs are driven by emotion, he tends to have much more of a "concede nothing" mentality -- even if he is sane. Can Jesus in the story use this as evidence that he really is Jesus? Again we run into the problem that irrationality blinds the irrational to their own irrationality. But it's still worth considering I think.
This isn't about Jesus Christ, and it isn't about schizophrenia. It isn't even about religion. It's about the Simulation Argument.
If we have good reason to believe that we will be reliably simulated many times in the future, than we can trivially conclude that we are almost certainly inone of the simulations.