Lynn Margulis blog tour

Lynn Margulis has sent the opening statement for her blog tour below. You should feel free to respond to it, raise other questions of any relevant sort, or say whatever you want in the comments; she’ll be along later today to respond to those that interest her. I will be policing the comments, so trolls, please don’t bother; serious comments only, and keep in mind that she’s only going to respond to a limited subset, so make ’em good.

In addition, she’ll be available later today in the Pharyngula chat room (channel #pharyngula on irc.zirc.org; if you don’t have an IRC client, that link will let you use your browser to join in) from 12:00-1:30pm ET. Dive in there for a more interactive give-and-take with Dr Margulis.

What a pleasure to write openly for Pharyngula even though, in principle, I am leery, even with this blog, of any internet participation. The haste and style online by its very breezy nature generates misinterpretation and misunderstanding. Nothing online written about me is entirely accurate, except perhaps my address at the University of Massachusetts.

Although misunderstanding permeates all human communication, the internet amplifies these tendencies. Sound bite-hype is far more useful to those who assert religious truths and would banish authentic science from the public sphere than to the scholar or scientist. Science itself, and even more so, science writing, ever cautious, ever tentative and ever questioning is permeated with boring hesitancies and stuttering qualifications. Most readers simply ignore it since they find it incomprehensible. The more accurate the scientific description, the more daunting the language to any outsider. The more clear the expression of a scientific idea is, the more specialized the terminology. The clearest scientific ideas are mathematical equations opaque to all but the specialist.

So, when reporters and popular writers attempt to communicate real science the plagues of distortion, misunderstanding and misrepresentation are inevitable. Any statement outside the immediate purview of the detailed science tends to be “translated” into common language. To express new ideas that challenge the paradigm in which the scientist works new language is required. If the language is too new neither the scientist nor the science popularizer is understood. Especially when one’s work is heterodox to the prevailing trend -it is easy to be dismissed as a “crank” or “on the fringe.” Or, even more likely, to be ignored. The convenient fiction, created by marketers and politicians, that “consensus” plays a major role in original science, helps to generate confusion in the lay public about the vast difference between established scientific fact and ideologically-driven nonsense.

Scientists seek evidence. Eclipses could not be predicted, calendars could not be distributed, tide tables could not be published, airplanes could not be built to fly, food plants not grown, bridges nor buildings built, in the absence of precise knowledge of celestial mechanics, gravity, air flow, soil nutrients, flowering plant sexuality, metal compression and tensional strengths, etc. Scientific facts, scientists know, lie in the details. Explanatory power, falsifiable prediction, reproducible experimental results underlie all scientific theory. Within the detailed framework there are no “scientific controversies”. Theories explain, hypotheses make precise predictions either verifiable or not, results are either reproducible or they aren’t. The most serious communication problem is that specialized knowledge, an arcane literature and years of specialized training are required for participation in any science and all science by its very nature is severely limited to its objects of study. No botanist can participate meaningfully in nuclear physics nor can physicists analyse genetic data. Science communicators, even the very best, and there many (e,g, those who write for Science News, Nature, Science and the New York Times Tuesday pages, National Public Radio and the like) can not comprehensibly describe anything without bias and oversimplification, ever. No writing, if it is to be widely understood, can be without bias. I believe that no meaningful distinction or description of anything, science included, can be made without an historical, including natural-historical, context. Yet most scientists live in the “now”; they tend to lack a long view and any knowledge outside the limits of their own specialized field. Sometimes their “field” is more a budget constraint or a whim of a dead scholar than a natural science. Some “fields”, clearly are not natural science, like the field called “cancer”. This implies that science writing too unavoidably displays bias, prejudice, nationalism, profound ignorance, incompleteness and other manifestations of “slanted truths”.

Scientists too often know little about the cultural and historical context of their ideas. Neo-Darwinians biologists, for example, really believe that “evolution” is a subfield of biology, especially zoology. Hence they ignore the non-zoological components of evolutionary science (e.g., all of historical geology including especially paleontology; environmental science, ecology, atmospheric chemistry, microbiology, etc.) They rarely acknowledge that their theoretical frames derive from an Anglophone-capitalist model, and inevitably carry the prejudices, assumptions and philosophical orientations of our milieu. Because most people interested in evolution live in an Anglophone-capitalist culture, assumptions of neo-Darwinians are unstated. Concepts such as the validity of “cost-benefit” and “competition vs. co-operation” terminology or the superiority of mathematical analysis are uncritically assumed. Many unstated assumptions are made because of the bias of the “evolutionary biologists”, the majority of whom have animal biology/zoological training who share our cultural orientation. There is, in fact, paltry evidence for the neo-Darwinian “thought-style”. The staunch neo-Darwinist claims have become less and less valid as information from other fields (e.g., molecular biology and the fossil record) has increased. It is not unusual, especially in the science of evolution, that theories contradictory to the neo-Darwinian “thought-style” are ignored or rejected, not on the basis of their claims, or proof of those claims, but on the, often unconscious, grounds that they do not agree with our biases. Read Ludwik Fleck.

So here we have an opportunity for open discussion – to listen to nature, to perceive the nature of nature, to reveal scientifically-documented facts beyond prejudices. We attempt, with civil dialogue based on sound science, to achieve, in good faith, an understanding of each other and the world. Science is limited, what is known for sure is miniscule in contrast to the great unknown, but the deliberate faith-based distortion of what really is known is despicable. We will avoid the cant, rant and desperate attempt to distort so common on both sides in the so-called “religion-vs science” debate. Whiteheadian philosophers, many Unitarian and Buddhist scholars, all true scientists agree with David Bohm’s sentiment that “science is the search for truth” whether or not we like that truth. And Emily Dickinson’s sentiment, from her poem “Tell all the Truth but tell it Slant ” is even more compelling:

As Lightning to the Children eased
With explanation kind
The Truth must dazzle gradually
Or every man be blind–

Lynn Margulis,
Mar 10, 2007

Coelacanth evolution

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I was reminded of one of the more comical, but persistent misconceptions by creationists in a thread on Internet Infidels, on The Coelacanth. Try doing a google search for “coelacanth creation” and be amazed at the volume of ignorance pumped out on this subject. I’ve also run across a more recent example of the misrepresentation of the coelacanth that I’ll mention later … this poor fish has a long history of abuse by creationists, though, so here’s a brief rundown of wacky creationist interpretations.

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Lynn Margulis weblog tour

Here’s an interesting opportunity: Lynn Margulis, the controversial scientist, is going on a ‘blog tour’ to promote her new imprint of science books called Sciencewriters Books. What does that mean? She’s going to hang out for a little while on a few blogs and chat and answer questions. If you’ve wanted to have a conversation with the author of the endosymbiont theory and critic of neo-Darwinian theory, here’s your chance.

The tour will kick off on Monday, 12 March, at Pharyngula. She’ll be sending me a short article that I’ll post that morning, and we’ll collect comments and questions. Later that afternoon or evening, she’ll browse through those comments and answer the ones she finds interesting.

In addition, she’ll be available in the Pharyngula chat room (channel #pharyngula on irc.zirc.org; if you don’t have an IRC client, that link will let you use your browser to join in) from 12:00-1:30pm ET.

So mark it on your calendars: an online conversation with Lynn Margulis, next Monday, 12 March, at Pharyngula.

What is science?

Vox Day asks a question: what is my definition of science? It’s a bit weird coming from him — he is not usually that lucid or civil — but OK, I’ll take it seriously.

Unfortunately, “science” is one of those hugely polymorphic terms that carries a tremendous amount of baggage, and any one definition is going to be inadequate. This is one of those subjects where a smart philosopher (Janet? John?) could go on at amazing length, and even then, everyone will argue with their summaries. I’ll just charge in, though, and give a couple of shorter definitions off the top of my head.

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Report from Planet Righty

Tim Lambert summarizes an informal survey of 59 right-wing bloggers: 100% of them deny the idea that humans are the primary cause of global warming, contradicting the scientific evidence. They were also asked about other issues—the majority approve of the “surge” in Iraq, think Bush is doing an acceptable job in foreign policy, and believe Democrats like the idea of losing the war in Iraq, but only on global warming is their unanimity.

It’s too bad the survey didn’t ask about other science issues. I’d like to know if they are similarly wrong about evolution, HIV as the cause of AIDS, and whether the earth goes around the sun rather than vice versa.

Orthozanclus

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(click for larger image)

Reconstruction of O. reburrus by M. Collins. The precise arrangement of the anteriormost region remains somewhat conjectural.

Halkieriids are Cambrian animals that looked like slugs in scale mail; often when they died their scales, called sclerites, dissociated and scattered, and their sclerites represent a significant component of the small shelly fauna of the early Cambrian. They typically had their front and back ends capped with shells that resembled those we see in bivalve brachiopods. Wiwaxiids were also sluglike, but sported very prominent, long sclerites, and lacked the anterior and posterior shells; their exact position in the evolutionary tree has bounced about quite a bit, but some argument has made that they belong in the annelid ancestry, and that their sclerites are homologous to the bristly setae of worms. One simplistic picture of their relationship to modern forms was that the halkieriids expanded their shells and shed their scales to become molluscs, while the wiwaxiids minimized their armor to emphasize flexibility and became more wormlike. (Note that that is a very crude summary; relationships of these Cambrian groups to modern clades are extremely contentious. There’s a more accurate description of the relationships below.)

Now a new fossil has been found, Orthozanclus reburrus that unites the two into a larger clade, the halwaxiids. Like the halkieriids, it has an anterior shell (but not a posterior one), and like the wiwaxiids, it has long spiky sclerites. In some ways, this simplifies the relationships; it unites some problematic organisms into a single branch on the tree. The question now becomes where that branch is located—whether the halwaxiids belong in a separate phylum that split off from the lophophorate family tree after the molluscs, or whether the halwaxiids are a sister group to the molluscs.

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Basics: Gastrulation, invertebrate style

The article about gastrulation from the other day was dreadfully vertebrate-centric, so let me correct that with a little addendum that mentions a few invertebrate patterns of gastrulation—and you’ll see that the story hasn’t changed.

Remember, this is the definition of gastrulation that I explained with some vertebrate examples:

The process in animal embryos in which endoderm and mesoderm move from the outer surface of the embryo to the inside, where they give rise to internal organs.

I described frogs and birds and mammals the other day, so lets take a look at sea urchins and fruit flies.

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Basics: Gastrulation

That guy, John Wilkins, has been keeping a list of presentations of basic concepts in science, and he told me I’m supposed to do one on gastrulation. First I thought, no way—that’s way too hard, and I thought this was all supposed to be about basic stuff. But then I figured that it can’t be too hard, after all, all you readers went through it successfully, and you even managed to do it before you developed a brain. So, sure, let’s rattle this one off.

In the simplest terms, gastrulation is a stage in early development; in human beings it occurs between two and three weeks after fertilization. It is that stage when a two-layered cell mass undergoes a set of specific movements and interactions that establish the three germ layers of the embryo (endoderm, mesoderm, and ectoderm) and the beginnings of a three-dimensional structure. The end result doesn’t look like much of an animal, but it has set up pools of cells that will contribute to specific future cell types, and has laid down the rough outline of tissues along the body axis.

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What use is an appendix?

Here’s an excellent and useful summary of the appendix from a surgeon’s perspective. Creationists dislike the idea that we bear useless organs, remnants of past function that are non-functional or even hazardous to our health; they make up stories about the importance of these vestiges. Sid Schwab has cut out a lot of appendices, and backs up its non-utility with evidence.

The study I cited most often to my patients when asked about adverse consequences of appendectomy is one done by the Mayo Clinic: they studied records of thousands of patients who’d had appendectomy, and compared them with equal thousands who hadn’t. (Back in the day, it was very common during any abdominal operation to remove the appendix. Like flicking a bug off your shoulder. No extra charge: just did it to prevent further problems: took an extra couple of minutes, is all.) The groups were statistically similar in every way other than presence of the worm. There were no differences in incidence of any disease. It’s as convincing as it gets, given the impossibility of doing a prospective double-blind study.

I have a personal interest in this: I was nearly killed by my appendix at the age of 9, and had it removed. I haven’t missed it since.