Immortal Jellyfish Defies Evolution
Those other jellyfish get the media attention, what with their bell shapes, lack of brains, deadly stinging tentacles and such. What about the "immortal jellyfish" that scientists call Turritopsis dohrnii ? Of course, they are 0.18 inches (4.5 mm) long, so they are difficult to see — but are in pretty much every ocean. Nothing physical is immortal, but T. dohrnii makes a good try though, barring accidents and such. They essentially regenerate themselves (no word if any carry sonic screwdrivers), reverting to an immature stage. Sometimes they even skip that stage. The process is amazingly complex. Turritopsis dohrnii , enlarged from Wikimedia Commons / Bachware ( CC BY-SA 4.0 ) On a side note, it has been said that youth is wasted on the young... Can you imagine starting over as someone much younger but retaining the knowledge you have? Of course, these critters lack brains, so there's not a whole lot of knowledge to draw from as they progress. Sometimes the jellyfish e...