Re: (ReacTor) Five SF Novels About Rediscovering Ancient Tech

On 15/05/2024 16:48, Paul S Person wrote:

On Tue, 14 May 2024 22:46:26 -0400, Cryptoengineer
<petertrei@gmail.com> wrote:
 

On 5/14/2024 3:47 PM, Christian Weisgerber wrote:

On 2024-05-14, Paul S Person <psperson@old.netcom.invalid> wrote:
>

So, like the car in /The World's End/, it is the same in one sense,
and yet not in another since almost everything has been replaced.

>
Aka "Ship of Theseus".  People have been philosophizing about this
for at least two millennia.
>

I've read that there was a medieval idea that all the material in
a human's body was replaced over 7 years, and that this is where
the notion  that 21 should be the age of majority came from.

 Oddly enough, I have run into the assertion that every cell in the
body is replaced every 7 years. Perhaps it's simply an updated
version.
 Not all replaced at once, of course. Your "over 7 years" captures that
quite well.

There's a belief in an indestructible bone of
the human body.  Specifically, this is mentioned
by Judaism and Islam - with or without being
official - but apparently not in Christianity.
<https://en.wikipedia.org/wiki/Luz_%28bone%29>