Cryonics occurs in two stages. A person must be legally dead before undergoing the first stage of cryogenic suspension. The vitrification process drains blood from the body and replaces it with an organ preservation solution and a cryoprotectant solution. Liquid nitrogen freezes the body quickly. The second stage of cryogenics is reviving the body. Cryogenics facilities claim to have successfully completed the first stage of cryonics, but no one knows if the second stage is possible.
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