Did you know that there's a jellyfish that cheats death? Meet the Turritopsis dohrnii, AKA the "immortal jellyfish". This tiny wonder can essentially turn back time and revert to its juvenile form, thanks to its incredible ability to regenerate cells. Imagine if we could all do that! While not truly immortal, this jellyfish can potentially live forever under the right conditions. It's like a real-life fountain of youth.