Does natural freeze tolerance in animals teach anything about cryonics?
While animals that survive partial freezing illustrate the principle that brain activity can stop and later resume, the condition of such animals is quite different from cryonics. Overwintering animals do not cool very far below 0ºC, and they still contain liquid between ice crystals. Cryonics involves more extreme dehydration, and complete solidification at cryogenic temperatures. With the possible exception of some insects and nematodes, no animal can naturally survive temperatures required for cryonics. The technology used in cryonics is derived from cryogenic tissue banking methods, not natural freeze tolerance.
