“The jellyfish that has cracked the secret to immortality”

From the Guardian:

[Turritopsis dohrnii] “is unique,” [says marine biologist Maria Pia Miglietta,] “because when faced with unfavourable conditions – and I mean high temperature, physical cutting, starvation, chemicals in the water, you name it – when you try to kill the jellyfish, it doesn’t die.”

Most normal jellyfish start off life as larvae. They metamorphose into polyps (tiny, stationary soft bodies) that bud off swimming medusas, which grow up to become adult jellies. Eventually, after reproducing, most will stop swimming, crumble a little and then die.

But the immortal jellyfish escapes that fate. It reverts to a juvenile form, and starts its life cycle again.

The process is called “cellular transdifferentiation,” Miglietta says. The jellyfish looks like it’s dying and sinks to the bottom. Then – like a butterfly returning to a caterpillar – it shrinks into a ball, and within 24 to 48 hours, buds off a new polyp with the same identical genome, she says. …

In the lab, where Miglietta studies them, these jellies can theoretically live for ever. However, for some in the wild, getting eaten may eventually end that dream run.

(My italics.)

Some more quotes:

James Lenman (“On Becoming Extinct,” p. 254):

The Second Law of Thermodynamics will get us in the end in the fantastically unlikely event that nothing else does first.

Peter van Inwagen (“The Possibility of Resurrection,” p. 121):

Perhaps at the moment of each man’s death, God removes his corpse and replaces it with a simulacrum which is what is burned or rots. Or perhaps God is not quite so wholesale as this: perhaps He removes for “safekeeping” only the “core” person – the brain and central nervous system – or even some special part of it.

John 3:3:

Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.

And see Lewis’s Mere Christianity – especially its last chapter, “The New Men,” to which everything in the book conduces.