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We spend billions every year on anti-aging creams and routines, but a creature the size of your pinky nail has already cracked the code. Found drifting in oceans worldwide, Turritopsis dohrnii- commonly dubbed the immortal jellyfish has a literal superpower: it doesn't die of old age.

Normally, biology forces everything to age in one direction. We get older, not younger. This specific jellyfish simply refuses to play by those rules. If it gets injured, starves, or just gets too old, it doesn't die. Instead, it pulls off a bizarre trick called cellular transdifferentiation . In plain English? Its adult cells completely reprogram themselves, reverting back to their infant phase. It’s essentially like a frog deciding to turn back into a tadpole because its environment got too stressful.

Let’s find out more about immortal jellyfish:

Immortal jellyfish: A reversible life cycle
To grasp exactly how wild this is, you have to look at how these animals grow up in the first place. Jellyfish usually start as swimming larvae, attach to the ocean floor to become a stationary "polyp" (which looks a bit like a tiny underwater plant), and eventually in the medusa stage the baby jellyfish bud off into the familiar bell shape, and floats away to live their lives as adults.

When the immortal jellyfish faces a crisis, it drops to the seabed and actually absorbs its own tentacles and bell. It morphs directly back into that plant-like polyp stage. From there, new, genetically identical jellyfish pop off and start swimming again. It literally rewinds its own life.

Why Science is obsessedNow, this doesn’t mean they are completely invincible. A passing fish or sea turtle can still easily make a prey out of them. But their ability to hit the reset button on aging is entirely unique in the animal kingdom.

Geneticists are intensely studying their DNA, looking at how they control stem cells and repair tissue so flawlessly. While we humans won’t be getting back to being toddlers anytime soon, understanding and studying this tiny ocean survivor might revolutionize the treatment of age-related disease in future.