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From: Robert Carnegie <rja.carnegie@gmail.com>
Newsgroups: rec.arts.sf.written
Subject: Re: (ReacTor) Five SF Novels About Rediscovering Ancient Tech
Date: Mon, 27 May 2024 16:37:11 +0100
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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>