The Immortal Jellyfish

There is a species of small jellyfish that will, when it is sick or injured, instead of dying, fully regenerate itself. It will sink “to the bottom of the ocean floor, where its body folds in on itself—assuming the jellyfish equivalent of the fetal position. The bell reabsorbs the tentacles, and then it degenerates further until it becomes a gelatinous blob. Over the course of several days, this blob forms an outer shell. Next it shoots out stolons, which resemble roots.” These stolons grow into new jellyfish.

Turritopsis dohrnii  (Wikipedia)

The description is from Nathaniel Rich’s article in the New York Times Magazine (Dec. 2, 2012). Over two years, one lab colony of such jellyfish rebirthed itself ten times. The jellyfish’s official name is Turritopsis dohrnii; its nickname, the Benjamin Button jellyfish. As different from humans as it may look, our genetic makeups are similar.

The immortal jellyfish is a specialty of Dr. Shin Kubota at Kyota University’s Seto Marine Biological Laboratory. Dr. Kubota spends much of his days feeding, caring for, and observing his wards. His expressed goal is to become young again himself, perhaps even to achieve immortality, or at least to point a way towards a cure for cancer.

We think of dying as a boundary that all living things share, part of the definition of being alive. But death is not so absolute. Clichés such as “you live and then you die” and “life is short” inadvertently call all the more attention to their exceptions. Bacteria, for example, don’t always die; they often divide. An individual bacterium may be destroyed or die from illness, injury, or antibiotics, but usually bacteria divide (or is it multiply?) into identical clones, which in turn will divide again.

And as for life being “short,” Buffalo grass, a prairie plant resistant to extreme weather, sprouts underground stems which in some locations may have been growing for the last 15,000 years. Among individual plants, the Bristlecone Pine named “Methuselah” still grows in California as it approaches its 5000th birthday. And Wikipedia’s lengthy “List of longest-living organisms” is not only long itself but has spawned the likes of “List of oldest dogs.”

I can understand that words for death and dying help people share their fears and grief when one of their group passes away from the circle of the living. And I can understand the simultaneous desire to imagine that that person is not “really dead” but is still alive in another realm. But perhaps we don’t need to reach into a spiritual world for such consolation. We might take to heart the models here on Earth of how living, reproducing, self-healing, and dying vary so widely among species.



Six Interesting Ways That Cars Are Like People

Cars are a favorite metaphor and mirror for us humans, from their vroom for the young to the creaks and breakdowns for the aging. The comparisons would seem to have been exhausted, but I keep running into new ones. Here are a few.



Some car comparisons occur to us because we can say that under certain circumstances, cars “die.” Atul Gawande discusses one aspect of how they do that in his book, Being Mortal: Medicine and What Matters in the End, although he mentions cars only once. He is explaining why genetics has little to do with how long we will live.

The classical wear-and-tear model may explain more than we know. Leonid Gavrilov, a researcher at the University of Chicago, argues that human beings fail the way all complex systems fail: randomly and gradually. As engineers have long recognized, simple devices typically do not age. They function reliably until a critical component fails, and the whole thing dies in an instant. [But complex systems with thousands of parts are engineered with layers of backup systems. And so are we.] We have an extra kidney, an extra lung, an extra gonad, extra teeth.

Nonetheless, as the defects in a complex system increase, the time comes when just one more defect is enough to impair the whole, resulting in the condition known as frailty. It happens to power plants, cars, and large organizations. And it happens to us: eventually, one too many joints are damaged, one too many arteries calcify. There are no more backups. We wear down until we can’t wear down anymore.

And then there’s oxidation. Here’s an excerpt from a booklet, Circumin: The 21st Century Cure, by Jan McBarron, MD, about anti-oxidants and the health benefits of a component of the spice turmeric:

Think about the rust on the bumper of a car. Rust is caused by oxidation or damaging oxygen molecules that corrode and eventually destroy the structure of metal. These same corrosive oxygen molecules…are found inside the human body…and contribute to the deterioration of cells.

The idea of a living car is cute Disney but unappealing otherwise, since it is the human driver who brings it to life. (

The idea of a living car is cute but unappealing otherwise, since the attraction of a car is that it is we ourselves who bring it to life.

Number three: Biologist Ursula Goodenough brings up car engines to make the point that while some random changes in the genes of organisms may work to our species’ benefit, those genes that set up the basic processes of cell assembly and maintenance have been humming along in all living things for billions of years. So organisms keep these efficient “housekeeping genes,” as she calls them, just as they are. “Changing them is like randomly modifying a carburetor or a timing belt after it’s already in synch with the rest of the engine: the usual outcome is that the car fails to run properly and often, as we say, the engine ‘dies’.”

I don’t remember where I read the idea behind number four: cars are like people in that both result from gradual processes of selection. For cars, the selector is not nature but the competition of the automotive marketplace. Any particular trait of a car or an organism will endure only if the versions that carry the trait succeed sufficiently to be widely reproduced.

Another evolutionary similarity. Cars are made to move. For humans too, motion has shaped us. Our oldest claim to organic uniqueness is that we walk on only two legs without a tail or feathers for support. Six million years ago, our ancestors clumsily rose up from four feet to two in order to get a better look as they walked across the savannah. The change helped trigger changes in our eyes, hands, legs, and brains. We, like cars, are made to move, and moving, in turn, made us.

Force and focus behind the wheel (

At the controls

Finally and more philosophically, the driving experience echoes the way that we experience ourselves as a mind inside a body. Cars give us an opportunity to be a heightened version of our brain-in-a-body selves. Most of the time we might feel like just a mishmash of thoughts inside a squishy physique. But put us in the driver’s seat and we’re a bigger, sleeker animal and a laser-like self.

The comparison goes further. We humans construct many entities besides cars that we can get into or put on—and in some sense “bring to life.” They include not only planes, trains, and ships but also clothes, buildings, novels, and even gods. In each of these, we position ourselves to be protected and enhanced and can readily identify with or personify the thing itself. We build and live in our protective houses and decorate them to make them reflections of ourselves. We “live” in the novels we read (or write) and imagine the living characters. And most strangely, we build gods and heroes by animating them with powers, passions, and virtues that we wish we had. All of these are cars of sorts, to transport and intensify us.