When the body is frozen, its cells are destroyed. There's no way to prevent this from happening (none that we know of, anyway). The answer from cryonics enthousiasts is always 'nanotechnology'. They believe that tiny robots will be used to repair the damage done to your cells during the freexing process. Needless to say, this sort of technology won't exist for a long, long time if ever. It's not clear that this would be possible even if such nanomachines existed, because a lot of information is simply lost during cell freezing. This is an especially big problem for the brain, where even slight changes can result in loss of memory or damage to a person's personality.
By the way, I think a couple of people here mentioned freezing frogs. Frogs can't really survive being frozen solid. They're able to survive very low temperatures because their bodies produce natural anti-freeze, which prevents their cells from freezing. This allows them to survive temperatures slightly below freezing because the freezing point of their body fluids is depressed. No frog can survive being frozen in liquid nitrogen.
On amorphous ice: the only way to create amorphous ice is to deposit water vapor directly into ice at very low temperatures without allowing it liquefy, or by freezing the water very very quickly. Obviously the first method isn't very useful for cryonics, and no one has been able to come up with a good way to freeze a body quickly enough for the second method. It's a really tough problem, because all of our freezing methods basically involve placing whatever you want to freeze into contact with something really cold. Liquid helium is about as cold as it's possible for something to be, but even it can't cool a body fast enough.
By the way, I think a couple of people here mentioned freezing frogs. Frogs can't really survive being frozen solid. They're able to survive very low temperatures because their bodies produce natural anti-freeze, which prevents their cells from freezing. This allows them to survive temperatures slightly below freezing because the freezing point of their body fluids is depressed. No frog can survive being frozen in liquid nitrogen.
On amorphous ice: the only way to create amorphous ice is to deposit water vapor directly into ice at very low temperatures without allowing it liquefy, or by freezing the water very very quickly. Obviously the first method isn't very useful for cryonics, and no one has been able to come up with a good way to freeze a body quickly enough for the second method. It's a really tough problem, because all of our freezing methods basically involve placing whatever you want to freeze into contact with something really cold. Liquid helium is about as cold as it's possible for something to be, but even it can't cool a body fast enough.
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