Two horrible new diseases

Scott Lanyon, director of the Bell Museum, has an article on two disease we should worry about, VHSv and EAS.

Personally, I think VHSv is the worst. It’s a virus that causes hemorrhagic septicemia in fish; just from the name you know it’s bad, involving blood and sepsis. My most horrible experience raising zebrafish was the time hemorrhagic septicemia swept through my colony and I had to euthanize every animal and bleach every last bit of plumbing to eradicate it. This disease has been detected in waters of Wisconsin, and it’s definitely not good.

EAS may not be as dramatically gory and lethal in its effects, but it strikes humans directly. It’s Evolution Avoidance Syndrome, and it causes the brains of scientists and journalists to seize up when circumstances are appropriate to discuss evolution in public. Apparently, we want local fish populations to develop, acquire, improve or have arise resistance to the hemorrhagic septicemia virus; we can’t possibly suggest that evolution might be at work.

Battling giants

Want to see Freeman Dyson and Richard Dawkins butt heads? It begins with a talk Dyson gave to an Edge conference in which Dyson (watch the whole talk) made these comments:

“By Darwinian evolution he [Woese] means evolution as Darwin understood it, based on the competition for survival of noninterbreeding species.”

“With rare exceptions, Darwinian evolution requires established species to become extinct so that new species can replace them.”

Dawkins rightly objects. Those are weird claims: the first is, I think, a misreading of Darwin. Darwin says something very different.

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Lucy’s legacy

As I’ve mentioned before, Lucy is going to be in Houston at the end of this week for an extended stay. This is not entirely a joyous occasion in the scientific community: many people, including Richard Leakey, are not happy that such a precious specimen has been subjected to the risks of travel. I sympathize. The bones of Lucy must be treated with the utmost care and regard, and any loss or damage would be an awful tragedy. However, there’s more to it than preserving an important fossil: Lucy is a touchstone to our past and is a symbol of the importance of our long history. We need to bring the ancient world to life for our citizens, and for not entirely rational reasons, people will want to see the real thing. I see that someone else shares my sentiment:

There is a wanton arrogance alive and kicking within the general scientific community. An arrogance that clings stubbornly to fact while at the same time stridently denying reality. And it pisses me the hell off. The facts in this case are clear: Lucy is one of the oldest hominid fossils ever discovered, and is very valuable for researchers. The reality of the situation is equally clear-cut, if a bit harder for the critics to swallow: Nobody gives a shit about replicas. Does it look the same? Sure. Can 99.9 percent of the population not tell the difference? You betcha. Does that matter? Not one iota. You see, for all the cranial capacity human beings have developed since little Lucy made do with a glob of gray matter the size of a key lime, we are not rational thinkers. Homo sapiens are, first and foremost, irrational and emotional.

I wouldn’t go so far as to call it arrogance, but there is a little selfishness to it, and most importantly, there’s a deep appreciation of the importance of that long-dead individual and a greater fear of its loss. What balances that fear, though, should be the recognition that other people could also stand to learn to love that tiny scrap of our long-past ancestry — the Lucy exhibit is an opportunity to teach.

Shouldn’t that be part of our mission? In addition to our own intimate learning of science, the task of sharing it with everyone else?

Nope, no aquatic apes found in Morris

How come you people never come visit? I’m only an hour from the freeway by way of a two-lane county road, roughly equidistant from Fargo, Sioux Falls, and Minneapolis, yet somehow no one ever happens to be passing through this remote rural town … until today. Jim Moore took a little detour from his road trip from Victoria, BC to Oklahoma to pop by lovely Morris, Minnesota and say hello. Now we expect the rest of you to come on by.

In case you don’t know who Jim Moor is, he maintains this web page, a critique of the Aquatic Ape “Theory”. This “theory” (really, it doesn’t deserve the promotion) is often taken as quite reasonable at first glance — hey, whales have reduced body hair and are aquatic, humans have reduced body hair so maybe they also went through an aquatic stage in their evolution — but once you dig just a tiny bit deeper, the inconsistencies within the hypothesis and the contradictions with reality loom larger and larger, and you really should realize that it’s utter nonsense. But weirdly, there are a number of people who have gotten quite obsessed with the idea and who have written reams of papers to rationalize the baloney. Back in the 20th century wrangles over the Aquatic Ape nonsense would spontaneously emerge on usenet all the time (here’s one example) because its proponents had to be completely refractory to contradicting evidence. Good times.

One interesting twist to it all is that it’s an odd variant of denialism. These people aren’t rejecting an established scientific conclusion, such as that HIV causes AIDS or that human activities contribute to global warming — they are pushing beyond reason for a conclusion that science denies. I suppose you could say they’re denying the evidence that shoots down their favored beliefs, but at least they actually have a positive (but bogus!) hypothesis that they aren’t afraid to recite at you, which puts them several notches above the Intelligent Design creationists.

Anyway, Moore has a tremendous amount of useful information rebutting the Aquatic Ape Speculation — it’s well worth a browse, and also amusing to read some of the crackpot defenses (one of my favorites is the claim that Neandertals had large noses that they used as snorkels). And I’m not just saying that because he was nice enough to stop by Morris!

Axis formation in spider embryos

Blogging on Peer-Reviewed Research

Some of you may have never seen an arthropod embryo (or any embryo, for that matter). You’re missing something: embryos are gorgeous and dynamic and just all around wonderful, so let’s correct that lack. Here are two photographs of an insect and a spider embryo. The one on the left is a grasshopper, Schistocerca nitens at about a third of the way through development; the one on the right is Achaearanea tepidariorum. Both are lying on their backs, or dorsal side, with their legs wiggling up towards you.

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There are differences in the photographic technique — one is an SEM, the other is a DAPI-stained fluorescence photograph — and the spider embryo has had yolk removed and been flattened (it’s usually curled backward to wrap around a ball of yolk), and you can probably see the expected difference in limb number, but the cool thing is that they look so much alike. The affinities in the body plans just leap out at you. (You may also notice that it doesn’t seem to resemble a certain other rendition of spider development).

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Clearly, bloggers need to take over science journalism

Aaargh. When will the media learn? National Geographic is running this ridiculous headline right now: New Fossil Ape May Shatter Human Evolution Theory, in which the reporter claims a discovery of some teeth could “demolish a working theory of human evolution.” It’s not true. Where is this nonsense coming from?

I read the article. It’s titled “A new species of great ape from the late Miocene epoch in Ethiopia.” The exciting news is that the “combined evidence suggests that Chororapithecus may be a basal member of the gorilla clade, and that the latter exhibited some amount of adaptive and phyletic diversity at around 10-11 Myr ago.” It concludes with a suggestion that we need to do more research in sediments appropriate to Miocene apes. There aren’t an exploding paradigms or revolutions suggested.

I read the associated news article in Nature. It’s titled “Oldest gorilla ages our joint ancestor.” It says that this discovery pushes back the time of divergence of the gorilla lineage from our own. This is just ordinary science.

Now read the blogs — they’re doing a much better job of evaluating this work than the traditional media. For one thing, they’re actually looking at it critically. Afarensis points out that these are only a few teeth, and it’s awfully thin grounds for a substantial revision of the timeline. John Hawks makes a similar point, but also highlights the fact that there is an unresolved problem — we need to reconcile paleontological and molecular dates. Even John Wilkins, a “mere” philosopher, weighs in sensibly that teeth are plastic characters in phylogeny, and deplores this peculiar media habit of taking a recalibration of a historical detail as a major reformulation of theory. All these discussions are sober and interested and most important of all, accurate.

The lesson is clear: when you see some wild and crazy claim of scientific revolutions and the demolition of long-held theories, go immediately to the science blogs for some clear-eyed sanity and informed evaluation from experts.

Wait until the creationists try to wrap their little minds around artificial life … oops, too late

Here’s some exciting news: Artificial life likely in 3 to 10 years. It is exciting but not surprising at all — but of course we’re going to be able to assemble entirely artificial life forms soon. It’s just a particularly complicated kind of chemistry, and it’s more of a deep technical problem than anything else. I wouldn’t be quite so specific about the date — there are also all kinds of surprises that could pop up — but I’m optimistic, and I think the overall assertion is supported by the increasing rate of accomplishment in the field.

But of course, in addition to the usual suggestions from interested followers of science that I should mention this cool article on the blog, I’ve gotten a few from creationist complainers (Already! See what my email is like?) Expect to hear more outrage from the religious right as this story develops in the coming years, which might be a good thing … they’re going to have to spread themselves thin to fight all the interesting work coming out of biology, and evolution won’t be the only target anymore. Anyway, here’s one of my creationists, expressing his unhappiness in odd directions.

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Endless Forms Most Beautiful

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I just finished Sean B. Carroll’s Endless Forms Most Beautiful: The New Science of Evo-Devo the other day, and I must confess: I was initially a bit disappointed. It has a few weaknesses. For one, I didn’t learn anything new from it; I had already read just about everything mentioned in the book in the original papers. It also takes a very conservative view of evolutionary theory, and doesn’t mention any of the more radical ideas that you find bubbling up on just about every page of Mary Jane West-Eberhard’s big book. One chapter, the tenth, really didn’t fit in well with the rest—the whole book is about pattern, and that chapter is suddenly talking about a few details in the evolution and development of the human brain.

So I read the whole thing with a bit of exasperation, waiting for him to get to the good stuff, and he never did. But then after thinking about it for a while, I realized what the real problem was: he didn’t write book for me, the inconsiderate bastard, he wrote it for all those people who maybe haven’t taken a single course or read any other books in the subject of developmental biology. I skimmed through it again without my prior biases, and realized that it’s actually a darned good survey of basic concepts, and that I’m going to find it very useful.

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