Today, scientists know of only one species of animal that can be called “biologically immortal.” These are tiny transparent ocean jellyfish Turritopsis dohrnii. They have the superpower to turn back time and return to the early stages of their life cycle.

For most jellyfish, the adult stage, ready to breed, is the last life stage, followed only by old age and death. But Turritopsis dohrnii can do the impossible. When faced with a stressful situation, such as injury or hunger, their bodies can return to the immature phase of their life. This transformation can be compared to the transformation of a frog into a tadpole and a butterfly into a pupa.

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