Cryopreservation

While 'cryopreservation' of human bodies for future revival is a concept, current technology can only achieve vitrification—a glass-like state—preventing ice formation. However, reversing this process without causing irreparable cellular damage, particularly to delicate brain tissue, remains an unsolved, complex challenge.

Certain frog species, like the wood frog, can survive having up to 65% of their body water freeze into ice. They produce a natural antifreeze (glucose) that protects their cells, allowing them to thaw out and hop away when spring arrives.