[FoRK] Extreme Life Extension: Investing in Cryonics for the Long, Long Term

Eugen Leitl eugen at leitl.org
Tue Jun 22 04:49:00 PDT 2010


On Tue, Jun 22, 2010 at 03:48:22PM +1000, silky wrote:

> > As far as I know, none of the cells that are currently me are the cells that I was born with.
> 
> Yes, I'm under this impression as well.

Parts of the CNS empirically see a turnover on less than 24 hour scale.
 
> Yes, you're still you (as far as I'm concerned). Because, I suppose,
> there is never more than 1 of you.

Single instances can't bifurcate. N instances will bifurcate,
unless synchronized. That'd take determinism, identical input,
and/or trajectory forcing (which would also work on biological
beings, forcing them into one consensual hallucination).
 
> I thought, though, you were talking about somehow replacing neurons
> with death-proof machine variants, or some sort of similar protocol.

A convenient approach is switch out modules when they're too degraded.
Halt the system, dump state, swap out, flush in state and resume.

> (I.e. nanotechology?) But I suppose for that to be permanent, you need

Yes, if you want to fix in vivo you need the whole enchilada. So
it doesn't help you today one bit. The next-best thing to stopped
time is cryopresevation (or fixation, but let's not go there atm).

> to stop aging. I wonder whether it's more efficient to try and solve
> our aging problem, or put us into computers. Depends which has the

The latter. SENS won't deliver on time, I'm afraid.

> best energy conversion ratio, I suppose.

Unreal estate is extremely cheap to render. Nevermind that
the bulk of those ~20 W your brain uses is just for maintaining
the equilibrium. Reversible logic in 3d solid state should do
a lot better than that.

Of course keeping up with the joneses will speed things up,
ultimatively as fast as we energetically can afford. 10^6 
speedup at least, up to 10^9 arguably. A megaday is a long time,
and a few gigayears  at 10^9 speedup is effective eternity.

-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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