X-Message-Number: 25844
From: "John de Rivaz" <>
References: <>
Subject: Re: [Cryonics Europe] National Geographic on cryonics
Date: Mon, 21 Mar 2005 15:49:45 -0000

with regards to

> there is no scientific evidence that a cryopreserved human will ever be
revived.

it is also true to say that no one now living, whether at the top of the
scientific, medical, legal, law enforcement or political professions can say
with absolute certainty (or even enough certainty to make correct life or
death decisions) that cryopreservation will **not** result in reanimation to
good youthful health.

-- 
Sincerely, John de Rivaz:  http://John.deRivaz.com for websites including
Cryonics Europe, Longevity Report, The Venturists, Porthtowan, Alec Harley
Reeves - inventor, Arthur Bowker - potter, de Rivaz genealogy,  Nomad .. and
more

----- Original Message ----- 
From: Giu1i0 Pri5c0
To:  ;  ;
 ; ExI chat list ;

Sent: 21 March 2005 10:02
Subject: [Cryonics Europe] National Geographic on cryonics


The National Geographic magazine has a good article on cryonics.
The prospect of cheating death raises a host of philosophical, moral,
and religious questions. But let's consider only the scientific
aspects.
Even proponents of cryonics, the practice of storing entire organisms
(or at least their brains) for future revival, admit there is no
scientific evidence that a cryopreserved human will ever be revived.
No one even knows what technology would have to be developed to
reverse the preservation.
Many questions surround the cryopreservation process itself. In
cryopreservation, cells and tissues are stored at frigid, cryogenic
temperatures - where metabolism and decay are almost stopped - for
future revival at normal temperatures.
But scientists have long known that the freezing process creates ice
crystals, which destroy cells and cellular structures.
A few years ago, cryobiologists discovered a new preservation process,
called vitrification, which virtually eliminates ice-crystal
formation. Rather than freezing the tissue, vitrification suspends it
in a highly viscous glassy state. In this mode, molecules remain in a
disordered state, as in a fluid, rather than forming a crystalline
structure.
http://news.nationalgeographic.com/news/2005/03/0318_050318_cryonics.html

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