Archives // Subscribe // Random Article

Legend has it that Juan Ponce de Leon’s exploration of Florida was driven by an irrational search for the Fountain of Youth.  Had he been born a certain type of jellyfish, he’d not have needed the Fountain.

The Turritopsis nutricula, right (photo via Boing Boing), a jellyfish found throughout the world, has a unique trait: biological immortality.  Turritopsis go through the typical life changes of any jellyfish — fertilized eggs hatch into larvae; the larvae grow to be polyps; in time, the polyps become fully mature jellyfish.  But the mature Turritopsis have an additional trick — they can shed their tentacles and bell and then revert back to the polyp stage.  In short: instead of getting old and dying due to their advanced age, Turritopsis instead become baby jellyfish and start life over again.

Of course, being this incredible comes with a price – Turritopsis are still, in the end, jellyfish, and tiny ones at that.  They grow to be only about a quarter-inch wide and are regularly susceptible to environmental dangers such as being eaten by larger organisms.  So while Turritopsis are able to turn back their own biological clocks, they aren’t actually immortal; rather, they’re readily killed in the normal course of ocean events.

Bonus fact:  While jellyfish aren’t known for their smarts, it turns out that octopuses may be much more intelligent than we thought.  A 2009 study suggests that they know how to use tools, even using tools.  Apparently, octopuses have been recorded carrying around empty coconut shells with the intention of hiding in them if a predator approached.

From the Archives: Conan the Bacterium: It’s not immortal, but it’s incredibly resistant to radiation.

Related: Magic Jellyfish, or something.

Originally published

NOW I KNOW is a free email newsletter of incredible things; you'll learn something new every day. Subscribe now!

NOW I KNOW is a free daily newsletter of incredible things; you’ll learn something new every day!

Written and distributed by Dan Lewis.

Click here to learn more about NOW I KNOW, or to subscribe.

Click here to see the full archives.

Click here to search the archives.


Copyright © 2010-2013 Dan Lewis. All rights reserved.

Now I Know is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Some images via Wikipedia, available for use here under a Creative Commons license, and copyright their respective owners.