hibernation

A hibernating ground squirrel can drop its body temperature to -3°C, slow its heart to one beat per minute, and stop breathing for up to an hour at a time — then wake up three months later with no organ damage and no muscle atrophy. Understanding how they pull this off is one of the most medically important questions in biology.

Bears enter hibernation — a state of profound metabolic depression where heart rate drops 90%, body temperature falls 10°C, and they survive months without eating. If humans evolved this ability, it would revolutionize medicine, space exploration, and civilization by allowing suspension of biological aging and safe exploration of extreme environments.