Did you know that there is a type of jellyfish that is considered immortal? Turritopsis dohrnii, also known as the “immortal jellyfish,” is capable of reverting back to its juvenile polyp state after reaching maturity. This means that it can essentially “reset” its life cycle and live indefinitely under the right conditions. While this doesn’t make the jellyfish truly immortal, it is a remarkable feat that has captured the attention of scientists and the public alike.