The jellyfish that hits the reset button on life

This tiny jellyfish can reverse its life cycle from adult back to a youthful polyp stage.

It uses a rare cellular process called transdifferentiation to reprogram its cells into younger versions.

They are not truly unkillable and often die from predation, disease, or accidents before they can revert.

Originally from the Mediterranean, they now travel the globe by hitching rides in ship ballast water.

Scientists study their unique DNA repair and regeneration genes to unlock secrets of human aging.