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For a long time, I thought cryonics was some kind of scam. That’s because I assumed they just froze you, and since ice takes up more space than the water that formed it, all your cells would get destroyed.
It turns out they use something called vitrification. Basically, they replace your blood with a liquid that doesn’t behave like water when it freezes.
There have even been experiments where researchers vitrified a rabbit kidney, then rewarmed it and transplanted it back into the rabbit. They have also vitrified rabbit brains and some parts of the human body.
The problem with cryonics is that if you wanted to put a person into a kind of cryo-sleep, you would have to cool each organ at different rates and use different cryoprotectants for each one.