Skeptophilia (skep-to-fil-i-a) (n.) - the love of logical thought, skepticism, and thinking critically. Being an exploration of the applications of skeptical thinking to the world at large, with periodic excursions into linguistics, music, politics, cryptozoology, and why people keep seeing the face of Jesus on grilled cheese sandwiches.
Showing posts with label photosynthesis. Show all posts
Showing posts with label photosynthesis. Show all posts

Wednesday, January 10, 2024

The air that I breathe

A month ago I looked at a geological oddity called banded iron formations -- alternating gray and red bands of iron-rich sediments that have been found all around the world, and all seem to date from about the same time (2.4 billion years ago).  These sedimentary deposits are thought to be the fingerprint of the Great Oxidation Event, when photosynthetic organisms began to pump so much molecular oxygen into the atmosphere that it literally changed the chemistry of the entire planet.

To understand how this happened will take a little bit of explaining.

Photosynthesizers such as plants, phytoplankton, and cyanobacteria evolved a trick for harvesting energy and storing it for use later.  Prior to this, all organisms were heterotrophs -- they required pre-formed organic compounds, which (fortunately for them) were abundant in the early oceans, created by the reducing atmosphere (reduced is chemist-speak for "capable of donating electrons") and sources of energy like lightning and ultraviolet light.  Heterotrophy back then was a fairly inefficient process.  The kind of energy processing they did only produced two ATP molecules, the energy currency of all cells, for every molecule of glucose metabolized.  (Glucose is the most commonly used energy containing molecule.)

Then, around 2.4 billion years ago a new metabolic pathway evolved that could produce ATP directly, driven by the energy in sunlight, rather than by breaking down pre-existing organic molecules.

This process, which probably was created by mutations in a chemosynthesis pathway of the kind we still see today in hydrothermal vent bacteria, used light-capturing pigments like chlorophyll to initiate a chain reaction called photophosphorylation to create ATP by the boatloads.  It required a source of electrons -- nearly all of the energy transfer in cells relies on the movement of electrons in what are called oxidation/reduction reactions -- and the cells performing photophosphorylation found it in abundance.

Water.

The problem was, pulling the electrons from water molecules makes them fall apart.  The result is a pair of hydrogen ions, which can be used for other chemical reactions in the cell -- and free oxygen, which is given off as a waste product.

This led to a huge problem for the rest of life on Earth, because to put not too fine a point on it, oxygen is really freakin' dangerous.  It is, unsurprisingly given the name, a strong oxidizer -- it's really good at pulling electrons away from other substances, which makes them fall apart.  This had the effect of stopping the natural production of food molecules in the ocean; with oxygen in the atmosphere and dissolved in the water, organic compounds now fell to pieces as soon as they were produced.

The result was that in the flip from a reducing atmosphere to an oxidizing atmosphere, nearly all life on Earth died.

The only survivors were:
  1. The photosynthesizers -- i.e., the ones who caused the problem in the first place.  They were able to make their own food, so they didn't give a damn if everyone else starved.
  2. A handful of anaerobic heterotrophs who were able to escape the oxygen.  We still have them today -- they live in places like anaerobic mud at the bottom of lakes and ponds.
  3. A small number of cells that had a pathway to detoxify oxygen.  This pathway involved essentially reversing photosynthesis, combining oxygen with hydrogen ions to lock it up harmlessly as water.  A side benefit -- which ultimately became its major benefit -- is that this is a powerful energy-releasing pathway, and once you can hitch it to ATP production, it's capable of producing 36 ATP molecules per glucose instead of 2, increasing the efficiency of energy capture by a factor of eighteen.  It has to be done in steps -- oxidizing molecules all at once is called "combustion" -- but if it can be slowed down and harnessed, it's a fantastic way of processing energy.  This stepwise oxidation, called the electron transport chain, was such a tremendous advantage that this group -- the aerobic heterotrophs -- basically went out and took over the entire planet.  In fact, they're our ancestors and the ancestors of all the other life forms on Earth that are dependent on oxygen.
The reason all this comes up is a recent discovery I was alerted to by a friend and loyal reader of Skeptophilia.  Researchers analyzing sedimentary rocks from Australia and Canada found fossils of single-celled organisms dating to 1.75 billion years ago that contain traces of thylakoids -- the layered membranes inside chloroplasts on the surfaces of which the oxygen-releasing photophosphorylation reactions take place.  So what we have here are fossils so finely preserved that they retain details not only of cells, nor the organelles inside cells, but the structures inside organelles inside cells.


And not just any old structures.  These, or ones very like them, are the same things that caused all the havoc during the Great Oxidation Event.

Emmanuelle Javaux, of the Université de Liège, who led the study, said, "Their production of oxygen led to accumulation of oxygen and profoundly modified the chemistry of the Earth’s oceans and atmosphere, and the evolution of the biosphere, including complex life."

It's astonishing that traces of these delicate organelles could last in the fossil record for 1.75 billion years.  It gives us a lens into an Earth we wouldn't even recognize, a time when there was nothing whatsoever living on the land, the most complex life was composed of simple clusters of cells, and the oceans were a rapidly-thinning soup of organic monomers.  In a very real sense these microscopic structures created the Earth we see around us today.  Without these tiny pancake-like membranes, the Earth would be a very different place -- one we would not find survivable.

****************************************



Friday, April 16, 2021

Algae aura

Can I just say that I am sick unto death of people misrepresenting science?

Some scientist somewhere makes a discovery, and it seems to take only milliseconds before every woo-woo with a favorite loony idea about how the world works is using it to support their claims.  These people have taken confirmation bias and raised it to the level of performance art.

A long-time loyal reader of Skeptophilia sent me a particularly good (or bad, as the case may be) example of this yesterday, in the form of an article by Michael Forrester called "People Can Draw Energy From Other People The Same Way Plants Do," that is apparently getting passed all over social media.  So let me illustrate my point by telling you what some of Forrester's conclusions from this scientific research are, and afterwards I'll tell you about the actual research itself.

See if you can connect the two.

Forrester says that we absorb "energies" from our surroundings.  He never defines what he means by "energy," but I'm pretty sure it's not the standard physics definition, because he includes stuff about being around "negative people."  He cites "psychologist and energy healer" Olivia Bader-Lee, who says:
This is exactly why there are certain people who feel uncomfortable in specific group settings where there is a mix of energy and emotions...  The human organism is very much like a plant, it draws needed energy to feed emotional states and this can essentially energize cells or cause increases in cortisol and catabolize cells depending on the emotional trigger...  Humans can absorb and heal through other humans, animals, and any part of nature.  That's why being around nature is often uplifting and energizing for so many people.
We're then given specific recommendations for how to "absorb and heal" efficiently.  These include:
  • Stay centered and grounded
  • Be in a state of non-resistance
  • Own your personal aura space
  • Give yourself an energy cleanse
  • Call back your energy
I was especially interested in the "energy cleanse" thing, and fortunately, Forrester tells us exactly how to accomplish this:
The color gold has a high vibration which is useful for clearing away foreign energy.  Imagine a gold shower nozzle at the top of your aura (a few feet above your head) and turn it on, allowing clear gold energy to flow through your aura and body space and release down your grounding.  You will immediately feel cleansed and refreshed.
So all I have to do is imagine it, eh?  Given that I spent 32 years working with teenagers, I wish I'd known that "owning your personal aura space" was something that would happen if I imagined it.  Teaching a room full of tenth graders is like trying to herd hyperactive puppies.  Since I found that yelling "BACK OFF" was seldom effective, it would have been nice if all I'd had to do was to picture my "aura space" (gold-colored, of course) and the teenagers would have been repelled backwards in a comical fashion, sort of like Yoda did to Count Dooku at the end of Star Wars: Attack of the Clones.

But I digress.


Okay. So you're probably wondering what scientific research led Forrester and Bader-Lee to come to this conclusion.

Ready?

The discovery by a team of scientists in the Biotechnology Department of Bielefeld University (Germany) that a species of algae can digest cellulose.

If you're going, "Um, but wait... but... how... what?" you should realize that I had exactly the same response.  I spent several minutes thinking that I had clicked on the wrong link. But no. In fact, Forrester even mentions the gist of the research himself:
Members of Professor Dr. Olaf Kruse’s biological research team have confirmed for the first time that a plant, the green alga Chlamydomonas reinhardtii, not only engages in photosynthesis, but also has an alternative source of energy: it can draw it from other plants.
And from this he deduces that all you have to do to be happy is to picture yourself underneath a gold shower nozzle.

I've seen some misrepresentations and far-fetched deductions before, but this one has to take the grand prize.

I get that people are always casting about looking for support for their favorite theories.  So as wacky as Forrester's pronouncements are, at least I see why he made them.  But what baffles me is how other people can look at what he wrote, and say, "Yes!  That makes complete sense!  Algae that can digest cellulose!  Therefore aura spaces and energetic quantum vibrations of happiness!

Okay, I admit that I can be a hardass rationalist at times.  But seriously, what are these people thinking?

Not much, is my guess.

So anyhow, watch out for those negative energies.  Those can be a bummer.  But if you're feeling like your vibrations are low, don't despair.  I hear that getting into psychic communication with algae can help.

********************************

If, like me, you love birds, I have a book for you.

It's about a bird I'd never heard of, which makes it even cooler.  Turns out that Charles Darwin, on his epic voyage around the world on the HMS Beagle, came across a species of predatory bird -- the Striated Caracara -- in the remote Falkland Islands, off the coast of Argentina.  They had some fascinating qualities; Darwin said they were "tame and inquisitive... quarrelsome and passionate," and so curious about the odd interlopers who'd showed up in their cold, windswept habitat that they kept stealing things from the ship and generally making fascinating nuisances of themselves.

In A Most Remarkable Creature: The Hidden Life and Epic Journey of the World's Smartest Birds of Prey, by Jonathan Meiberg, we find out not only about Darwin's observations of them, but observations by British naturalist William Henry Hudson, who brought some caracaras back with him to England.  His inquiries into the birds' behavior showed that they were capable of stupendous feats of problem solving, putting them up there with crows and parrots in contention for the title of World's Most Intelligent Bird.

This book is thoroughly entertaining, and in its pages we're brought through remote areas in South America that most of us will never get to visit.  Along the way we learn about some fascinating creatures that will make you reconsider ever using the epithet of "birdbrain" again.

[Note: if you purchase this book using the image/link below, part of the proceeds goes to support Skeptophilia!]



Thursday, November 29, 2018

The origin of oxygen

One of the (many) things I love about science is the fact that for every discovery made, a slew of new questions open up.

Sometimes, "a slew" doesn't even cover it.  There have been discoveries that have revolutionized entire fields.  For example, when J. Tuzo Wilson, Harry Hess, and others developed the plate tectonics model in the early 1960s, to explain the magnetic mapping of the Atlantic Ocean, it explained a whole lot of other things -- why there are always volcanoes near oceanic trenches, why the coastline of North and South America fits together with Europe and Africa as if they were puzzle pieces, why the Himalayas are not volcanic, but are an earthquake zone (and are, in fact, still rising).  But it opened up a huge number of other questions -- why volcanoes in different spots have different characteristics (for example, the hot, fluid lava of Kilauea as compared to the monstrous explosions of Mount St. Helens and Vesuvius), why coastal California is made up of dozens of unrelated chunks of rock (which go by the delightful name of "suspect terranes"), and -- most importantly -- what force is driving the entire process.

Geologists are still devoting their careers to understanding the outfall from that one discovery.

A study published earlier this month in Geobiology has that characteristic of good science -- of solving one question and in the process opening up lots of others.  Called, "The Early Archean Origin of Photosystem II," by Tanai Cardona and A. William Rutherford of Imperial College of London, Patricia Sánchez‐Baracaldo of the University of Bristol, and Anthony W. Larkum of the University of Sydney, at first seems as if it would only be of interest to people who are fascinated with the gruesome biochemical details of photosynthesis.  Photosystem II is an array of proteins and pigment molecules that forms one of the two "light traps" in chloroplasts (the other, unsurprisingly, is called "photosystem I").  So who, other than botanists, really cares when it evolved?

Well, it turns out that the timing of this event is mighty peculiar -- because apparently photosystem II, central to the glucose-production system of all plants, arose around 3.4 billion years ago -- 700 million years before the earliest known autotrophs, the cyanobacteria (commonly called "blue-green algae").

The way this was discovered was a technique called a molecular clock -- using a known mutation rate for a specific gene to estimate when related genes in different organisms had a common ancestor.  (As a wildly oversimplified example, if you know that the rate of mutation in a particular gene cluster is 1 base pair change per million years, and that gene cluster in species A has 23 differences from the related gene cluster in species B, you can infer that the most recent common ancestor between A and B occurred 23 million years ago.)

Here, the researchers looked not at genes in two different organisms, but two different proteins in the same organism -- photosystem I and photosystem II, the genes for which were once a single piece of DNA that diverged in two directions.  And if you use the molecular clock technique to estimate when the common ancestor of those two genes was, you get a number way bigger than anyone expected.

The cyanobacteria Tolypothrix [Image licensed under the Creative Commons Matthewjparker, Tolypothrix (Cyanobacteria), CC BY-SA 3.0]

This is strange.  The geological evidence is pretty clear that earlier than 2.7 billion years ago, the atmosphere had no free oxygen.  So if photosynthesis -- the major oxygen-producing activity on Earth -- evolved 700 million years before significant quantities of oxygen accumulated in the atmosphere, it raises two awkward questions:
  1. Who was doing it?
  2. Where did all the oxygen go in the interim?
I'm sure these questions have perfectly rational answers.  It's possible cyanobacteria evolved a lot earlier than we'd thought -- after all, they're not common as fossils.  It could be that at first some biological or geological process was locking up the oxygen as soon as it was released, so it took a long time for it to start building up to levels that would leave a discernible fingerprint in the rocks.  It could be that something's confounding the molecular clock data and causing it to give an inaccurate result -- although in reading the paper, to my only moderately-trained eye, this doesn't look at all likely.  The analysis was careful, thorough, and painstaking.

It could also be that the earliest photosystems were simply much less efficient than today's, so their ability to oxidize water was insufficient to lead to an oxygen buildup in the atmosphere.  Or that the ancestral gene/protein for today's photosystems had a different purpose for the organisms that had them, and only afterwards was co-opted to store energy and synthesize food -- a phenomenon called preadaptation.

Or maybe something else.  The point is, it's a peculiar and fascinating discovery.  And like many peculiar and fascinating discoveries, I'm sure it will lead to further questions -- and, with hard work, insight, and a grain of luck, a whole host of further answers.

*************************************

Ever wonder why we evolved to have muscles that can only pull, not push?  How about why the proportions of an animals' legs change as you look at progressively larger and larger species -- why, in other words, insects can get by with skinny little legs, while elephants need the equivalent of Grecian marble columns?  Why there are dozens of different takes on locomotion in the animal world, but no animal has ever evolved wheels?

If so, you need to read Steven Vogel's brilliant book Cats' Paws and Catapults.  Vogel is a bioengineer -- he looks at the mechanical engineering of animals, analyzing how things move, support their weight, and resist such catastrophes as cracking, buckling, crumbling, or breaking.  It's a delightful read, only skirting some of the more technical details (almost no math needed to understand his main points), and will give you a new perspective on the various solutions that natural selection has happened upon in the 4-billion-odd years life's been around on planet Earth.

[If you purchase the book from Amazon using the image/link below, part of the proceeds goes to supporting Skeptophilia!]






Thursday, April 5, 2018

Nature walk

Mark Twain once said, "The difference between fiction and reality is that fiction has to be believable."

I ran across a particularly good example of that yesterday over at the site Mysterious Universe.  It's the story of one Katherine Brewster, a 27-year-old woman from England, who was visiting Brazil.  On the morning of March 26, she went for a walk down a trail in the jungle... and didn't return.

I've been to the jungle -- specifically, the Amazon lowlands of Ecuador and the Taman Negara region of Malaysia -- and I can say from personal experience that they are not places where you'd want to get lost.  The jungle abounds in plants with various kinds of toxins, not to mention sharp spines.  Many of the animals there specifically want to kill you in unpleasant ways.  Because of the high biodiversity and extreme competition for niches, the organisms there have evolved some pretty terrifying adaptations -- venom, talons, and big, nasty, pointy teeth to name three.  In Malaysia, I found out that they even had terrestrial leeches -- bloodsucking critters who hide in the leaf litter and then crawl up your leg to find a nice spot to fasten on.

I'm not normally squeamish, but these guys skeeved me out so much that I took to dousing my boots daily in a repellent containing DEET.  It worked, but if I ever throw those boots away, I'm going to have to file an Environmental Impact Statement.

[image courtesy of the Wikimedia Commons]

So getting lost there would be a seriously bad idea, which is why Katherine Brewster's friends and family were in a panic.  When a search party found no trace, and two, then three days went by, everyone feared the worst.  But then five days later she walked out the jungle, covered with cuts, bruises, and insect stings, saying that a "divine voice" had told her to trek into the wilderness, and while she was there she learned to talk with the plants, who had taught her how to perform photosynthesis.

At this juncture, I feel obliged to tell my readers that I'm not making this up.

Besides becoming photosynthetic, Brewster also said the plants told her about this thing called the "morphogenetic field."  Here's her explanation:
[C]onsciousness within form connects everything. We have access to the whole universe, all we need to do is to detach ourselves from the material.  We are thus the intrinsic consciousness of the universe.
Whatever that means.  As far as how she avoided starving, she said that the plants themselves told her which ones were safe to eat:
The plants were taking to me, telling me which ones I could eat, which ones I could make tea with, or to heal a wound with.  The messages would come in words. It was more like having a conversation with the plants.
I'm not entirely sure that even if plants could talk, I'd believe what they said.  My sense is that the multiflora rose currently taking over my entire back yard, for example, is actively evil.  It's constantly doing things like sitting there, looking innocuous, then when I get a little too close, or worse, come at it with a pair of clippers, it reaches out and skewers me with thorns as sharp as hypodermic needles.  My son, who sometimes has more good intentions than sense, once attacked a multiflora rose bush with a machete.  He was successful at hacking it back some, but came out of the encounter looking like he'd been mauled by a jaguar.

Brewster, on the other hand, seemed to view everything she encountered on her little impromptu nature walk as being benevolent.  She even said she came to an understanding with the insects -- specifically, that they could bite her or sting her if they wanted to.  She said that she needed to "learn from the experience," which doesn't to me sound like an "understanding" so much as a statement of "fuck it, I give up."  I'm not sure what you could learn from a wasp sting other than "It hurts like hell," but for some reason she felt the need to let the bugs know that she meant them no harm.

My guess is that the wasps all went back to their nests and told their friends where she was.  "Go sting this chick," they probably said, in Wasp.  "She just kind of stands there with this bemused smile on her face."

Wasps are a little like multiflora rose in that respect.

So anyway, Brewster said she learned a lot from her experience, most strikingly how to synthesize her own food using sunlight as an energy source.  Myself, I didn't think that's something that could be taught.  I thought you needed all these enzyme systems and subcellular structures and so on in order to photosynthesize.  But I'm just a biologist.  What do I know about morphogenetic fields, and whatnot?

Amazingly, Brewster also says she's ready to go back in and do another Back-to-Nature trek again.  I guess the plants haven't taught her enough yet.  Maybe this time she'll learn how to make flowers come out of her ass, or something.  I dunno.  But one thing I'm sure of: the wasps are probably already preparing their welcome.

Wednesday, September 28, 2016

Algae aura

Can I just say that I am sick unto death of people misrepresenting science?

Some scientist somewhere makes a discovery, and it seems to take only milliseconds before every woo-woo with a favorite loony idea about how the world works is using it to support their claims.  These people have taken confirmation bias and raised it to an art form.

I saw a particularly good (or bad, as the case may be) example of this yesterday in an article by Michael Forrester called "People Can Draw Energy From Other People The Same Way Plants Do," that is getting passed all over social media.  So let me illustrate my point by telling you what some of Forrester's conclusions from this scientific research are, and afterwards I'll tell you about the actual research itself.

See if you can connect the two.

Forrester says that we absorb "energies" from our surroundings.  He never defines what he means by "energy," but I'm pretty sure it's not the standard physics definition, because he includes stuff about being around "negative people."  He cites "psychologist and energy healer" Olivia Bader-Lee, who says:
This is exactly why there are certain people who feel uncomfortable in specific group settings where there is a mix of energy and emotions...  The human organism is very much like a plant, it draws needed energy to feed emotional states and this can essentially energize cells or cause increases in cortisol and catabolize cells depending on the emotional trigger...  Humans can absorb and heal through other humans, animals, and any part of nature.  That's why being around nature is often uplifting and energizing for so many people.
We're then given specific recommendations for how to "absorb and heal" efficiently.  These include:
  • Stay centered and grounded
  • Be in a state of non-resistance
  • Own your personal aura space
  • Give yourself an energy cleanse
  • Call back your energy
I was especially interested in the "energy cleanse" thing, and fortunately, Forrester tells us exactly how to accomplish this:
The color gold has a high vibration which is useful for clearing away foreign energy.  Imagine a gold shower nozzle at the top of your aura (a few feet above your head) and turn it on, allowing clear gold energy to flow through your aura and body space and release down your grounding.  You will immediately feel cleansed and refreshed.
So all I have to do is imagine it, eh?  Given that I work with teenagers, I wish the "owning your personal aura space" was something that would happen if I imagined it.  Teaching a room full of tenth graders is like trying to herd puppies.  Since yelling "BACK OFF" is seldom effective, it'd be nice if all I had to do was to picture my "aura space" (gold-colored, of course) and the teenagers would be repelled backwards in a comical fashion, sort of like Yoda did to Count Dooku at the end of Star Wars: Attack of the Clones.

But I digress.

[image courtesy of the Wikimedia Commons]

Okay.  So you're probably wondering what scientific research led Forrester and Bader-Lee to come to this conclusion.

Ready?

The discovery by a team of scientists in the Biotechnology Department of Bielefeld University (Germany) that a species of algae can digest cellulose.

If you're going, "Um, but wait... but... how... what?" you should realize that I had exactly the same response.  I spent several minutes thinking that I had clicked on the wrong link.  But no.  In fact, Forrester even mentions the gist of the research himself:
Members of Professor Dr. Olaf Kruse’s biological research team have confirmed for the first time that a plant, the green alga Chlamydomonas reinhardtii, not only engages in photosynthesis, but also has an alternative source of energy: it can draw it from other plants.
And from this he deduces that all you have to do to be happy is to picture yourself underneath a gold shower nozzle.

I've seen some misrepresentations and far-fetched deductions before, but this one has to take the prize.

I get that people are always casting about looking for support for their favorite theories.  So as wacky as Forrester's pronouncements are, at least I see why he made them.  But what baffles me is how other people can look at what he wrote, and say, "Yes!  That makes complete sense!  Algae that can digest cellulose!  Therefore aura spaces and energetic vibrations of happiness!

Okay, I admit that I can be a hardass rationalist at times.  But seriously, what are these people thinking?

Not much, is my guess.

So anyhow, watch out for those negative energies.  Those can be a bummer.  But if you're feeling like your vibrations are low, don't despair.  I hear that getting into psychic communication with algae can help.

Friday, April 27, 2012

Walking on sunshine

At what point, when someone believes something that is counterfactual, unscientific, and (to put not too fine a point on it) ridiculous, does it become the person's fault for not knowing better?

We live in a culture which, to a large extent, has an expectation that people should be protected from the effects of their own stupidity.  This extends to the availability of insurance, and claims for government aid, when people build their houses in areas that are known to be targets for natural disasters.  When a five million dollar house is built onto a canyon wall in earthquake-prone, mudslide-prone, wildfire-prone California, and it (to borrow a phrase) burns down, falls over, and sinks into the swamp, and the owner acts all mystified that it happened, how sympathetic should we be?

This question isn't just relevant to matters of property loss; it also is appropriate to ask in a great many issues of personal safety.  Take motorcycle helmet laws.  Take smoking cigarettes.  Who, at this point, doesn't know the dangers of these behaviors?  At some point, it is not the government's responsibility to prevent us from doing stupid stuff; it is ours.

The matter becomes a little fuzzier with medical issues, because (1) people are trained from birth to listen to white-coat-wearing individuals with stethoscopes, (2) there's a huge profit motive to the whole quack-cures industry, inducing charlatans to spend a lot more time and effort pushing their claims, and (3) human physiology is a great deal more complicated than "if you ride a motorcycle without a helmet, and get in an accident, you will be turned into a giant splat mark on the asphalt."  Still, I can't help but think that there is a point at which it is the consumer's personal responsibility to be well enough informed that (s)he won't do anything egregiously idiotic, such as trying to treat an illness by taking pills that have had every last potentially useful molecule removed by serial dilution.

But homeopathy isn't my topic today; the genesis of this post is something even stupider.  Something that makes homeopaths seem worthy of the Nobel Prize in Medicine.  Something so monumentally idiotic that I felt obliged to dig around and see if it could possibly be a hoax.

Tragically, it is not.  It really seems to be true that a Swiss woman died last year -- after a guru convinced her that she could live on sunlight alone.  (Source)

Apparently the woman, whose name was not released by the press but who was a resident of the town of Wolfhalden, had had some health problems, and after being unsatisfied with the medical care she was receiving from actual doctors, she decided to ask a guru's advice.  The guru said he was 70 years old and was still in prime health, and had done it by giving up food and water entirely decades ago.  He said all you had to do was to sit in the sun with large sectors of your skin exposed, absorbing the sun's "life-giving rays," and that if you had reached a high enough plane of spiritual consciousness, that'd be all you'd need not only to survive, but to thrive.

The article didn't say, but I'd bet hard cold cash that the guru also used the words "resonance," "frequency," and "vibration."

Anyhow, the woman didn't do what I'd like to think most of us would do in that situation, which is to burst into guffaws and say, "What the hell?  Do I look like a house plant to you?"  And walk away.  No, she apparently said, "Wow!  I never thought of that!" and proceeded to stop eating and drinking.  She spent a great deal of time sitting, scantily-clad, in the sun.  And amazingly enough, she succeeded not in curing her illnesses -- but in starving to death.

An unanswered question I had is how on earth her friends and relatives let this happen.  If I saw some nimrod I knew stop eating anything and spending large quantities of time sitting outside naked, I think I would probably question whether he'd lost his marbles, and try to intervene.  But either she didn't have enough close friends, or hid it from them well enough, that by the time she was admitted to medical care, it was too late to save her.

This, of course, has elicited calls to prosecute the guru.  My general thought is that this is probably justified, because victimizing stupid people is a pretty terrible thing to do, but there's a part of me that can't get all that worked up about this.  Shouldn't we have an expectation, as a presumably educated society, that people will at least understand biology to the extent that they know that humans cannot conduct photosynthesis?  If there really is someone who is that dumb, or that gullible, should the authorities step in to protect them from the consequences of their foolishness?

I think that at some point, personal responsibility has to kick in.  If we fail to educate ourselves on issues of vital importance to our health and happiness, and then become victims of natural disasters, preventable accidents, hucksters, and frauds, it is no one's fault but our own.  And as far as the Swiss woman who thought she was a plant; this, to me, is just a case of natural selection in action, improving the gene pool for the rest of us.