Lida Xing from the China University of Geosciences in Beijing was walking through an amber market in Myitkina, Myanmar when he discovered a rather interesting specimen. The seller believed that the large chunk of fossilized tree sap they were selling contained plant material. Xing recognized that it contained primitive feathers. Even more exciting, those feathers were not connected to a bird ancestor, but to the tail of a dinosaur.
A scientific analysis of that specimen has now been published in Current Biology.
This is a tremendous specimen for a number of reasons. Scientists interested in the evolution of feathers have been trying to piece together the developmental steps that occurred and in what order in order to transform scales into feathers. Developmental biology itself provides some clues – the path that feathers take when they develop in the embryo likely reflect their evolutionary history. It would be nice, however, to confirm this hypothesis with actual specimens.
Up until now paleontologists have had two kinds of fossil feathers. The first is feather impressions associated with fossil specimens. The advantage of this kind of evidence is that we know exactly what species the feathers belong to and so they can be placed in a phylogenetic tree of feathered dinosaurs, both avian and non-avian. The disadvantage is that the feather impression are compressed, so the three-dimensional information may be lost, and they often lack fine detail.
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Researchers at Harvard did a clever thing. They created a giant plate on which to grow bacteria, and included in the plate increasing concentrations of an antibiotic as you moved toward the center. They then plated bacteria on the outer edges and made a time-lapse video of the bacteria growing.
The end result was a video showing the evolution of progressive antibiotic resistance in the bacteria. You can actually see adaptive radiation, as the bacteria push up against the boundary to the next higher concentration of antibiotics, then multiple locations start to spawn new colonies spreading in the next zone.
The researcher made some more nuanced observations as well. For example, the bacterial grow slowed with new mutations, meaning they sacrificed something with the resistance mutation, but then they sped up again as they further evolved. Further, the most resistant bacteria were often not at the leading edge but were stuck behind less resistant bacteria.
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It is my universal experience, after more than thirty years of confronting various forms of evolution denial or creationism, that creationists simply do not understand evolution. If any do understand it, they pretend not to. I guess they have no choice – they are motivated to deny an established scientific theory. They need to pretend they know better than the world’s experts, or that the world’s experts are lying and deceitful.
Mike Pence is a run-of-the-mill creationist. His denial of evolution is unremarkable and unimaginative, but now he is running for Vice President so his views serve as a ripe target for criticism. In a speech before the House he decided, for some reason, to go on a rant against evolution. For those who are interested, it is a good opportunity to play “name that logical fallacy” and you may want to watch the video and count the errors before reading ahead.
Pretty much everything Mike Pence says in the speech is wrong or misleading, except for trivial facts. He starts by setting the stage with Darwin publishing On the Origin of Species and presenting the theory of evolution. That evolution is just a “theory” is a main theme of his speech, which I will get to in a moment, but first he follows up by saying that Darwin expected his theory to be proven correct by the fossil record. He concludes that Darwin did not live to see this happen, and neither have we.
Is Evolutionary Theory Proven? Continue Reading »
One of the recurring themes of this blog, and of the skeptical movement itself, is that science news reporting is generally poor. It is highly variable – there are some excellent science news reporters out there, but most are mediocre and some are terrible. The problem is that the average quality is simply too low.
The problem is compounded by the fact that scientists sometimes overhype or overinterpret their results, but even more common, the press office for the university at which the scientists work often sensationalize the science. At every step there is an opportunity to add hype, misinterpret the actual results, sensationalize, focus on the speculative aspect of the study rather than the actual data, or simply get the story wrong.
The race for clicks seems to be driving the quality of science reporting down, favoring clickbait headlines. Reporters don’t seem to mind getting the story wrong and then being corrected by science bloggers, for then they just get another round of clicks correcting their own bad reporting as if it were someone else’s fault.
Sclerocormus parviceps Continue Reading »
Pointing out how completely illogical and unscientific are creationists is something I need to do on a regular basis here. A creationist who regularly trolls the SGU Facebook page recently posted this video, which is a great opportunity to meet my creationist debunking quota.
Like all creationist propaganda, the video does not make any serious or legitimate scientific points. The purpose is just to provide a plausible screen for denying one of the most solid scientific facts every established – that life on Earth is the product of organic evolution.
The video is a collection of “gotcha” ambushes of students and scientists, asking them loaded questions that defy a simple answer (because first you would have to unpack all the false assumptions in the question itself). It’s natural to pause after such a question, while considering how best to approach it. The segments often cut out after the initial partial response followed by a “gotcha” follow up statement by the interviewer.
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This week I have been making my way through a list of old and debunked creationist arguments put together by Michael Snyder (a young-earth creationist), giving the old arguments new life on social media. As science communicators we often have to play this game of whack-a-mole, persistently addressing points that have already been refuted. Each time is an opportunity to educate more people about the real science of evolution, about logic and critical thinking, about science in general, and the vacuous and deceptive arguments of the science deniers.
This is the fourth and final installment of this series of posts. You can find the others here: Part I, Part II, and Part III.
The next five points that Snyder raises are all variations on the same theme:
#30 Which evolved first: blood, the heart, or the blood vessels for the blood to travel through?
#31 Which evolved first: the mouth, the stomach, the digestive fluids, or the ability to poop?
#32 Which evolved first: the windpipe, the lungs, or the ability of the body to use oxygen?
#33 Which evolved first: the bones, ligaments, tendons, blood supply, or the muscles to move the bones?
#34 In order for blood to clot, more than 20 complex steps need to successfully be completed. How in the world did that process possibly evolve?
Snyder, of course, is asking a false question, one with an unstated major premise that is wrong, or at least misleading. The implication he is trying to make is essentially the debunked notion of irreducible complexity – that complex structures or biological systems could not have evolved because they could not have simpler functional states.
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This is the third post dealing with a recent aggregation of old creationist arguments that has been making the rounds on social media, 44 Reasons Why Evolution Is Just A Fairy Tale For Adults. The author, Michael Snyder, has shown a typical level of horrific scholarship and reasoning. Post 1 is here, and post 2 is here.
In the last article I discussed the claim that the Coelacanth is a “living fossil” (a term I despise because it is ripe for confusion). Essentially Snyder and other creationists treat the Coelacanth as if it is a specific species, when in fact it is an order of fish. An order surviving for hundreds of millions of years is not at all unusual.
In the next of Snyder’s reasons he commits the same mistake:
#18 According to evolutionists, the Ancient Greenling Damselfly last showed up in the fossil record about 300 million years ago. But it still exists today. So why hasn’t it evolved at all over the time frame?
This claim is entirely wrong, demonstrating sloppy research. Actually I suspect that Snyder did no research (and here I am just referring to looking up reliable references). He seems to have just swallowed a creationist meme whole from the Institute for Creation Research, specifically an article by their “science writer” Brian Thomas.
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When did our ancestors first start to use tools? That is a very interesting question, and immediately leads to the question of how we could know. What kind of evidence could there be to establish human tool use?
The most obvious evidence would be the tools themselves. Fortunately stone tools are made of stone, which is highly durable and can last millions of years. Earlier this year researchers published evidence of the now earliest known stone tools, from 3.3 million years ago. This finding was significant for several reasons.
First, it pushed back tool use 700,000 years. Perhaps even more significant, prior to this find the oldest confirmed stone tools were associated with the species Homo habilis, the first of the Homo genus that led to modern humans. It could therefore be said that sophisticated tool use (meaning modified tools that can be recognized) was unique to the Homo genus. These new tools, called the Lomekwian tool culture, predate Homo habilis, and are likely associated with Australopithecus afarensis.
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Yesterday was February 12th, the birthday of Charles Darwin, who introduced (along with Alfred Wallace) the theory of evolution to the world. Darwin remains one of the most famous scientists to have ever lived, and his life’s work was truly a staggering accomplishment.
There has been an increasing movement to make February 12th Darwin Day in recognition of this great scientist and his work. Skeptics and secularists have been celebrating it for years. Last month Delaware governor Jack Markell declared February 12th Darwin Day for his state. In the US Congress, Representative Jim Himes (D-Connecticut) has sponsored a bill to make February 12th Darwin Day. This will probably die in committee, like previous similar resolutions, but at least someone is trying.
Creationists, predictably, are not happy. Ken Ham want February 12th to be declared, “Darwin was wrong day.” This, of course, is nothing new, but is an opportunity to reveal the thought process of some creationists. Some creationists like to pretend they reject evolution because they disagree with the science. This is transparently not true – the reject evolution because of their religious faith, and then just backfill whatever justifications they can manufacture with motivated reasoning.
Ham reveals this to be the case when he writes:
But those who promote Charles Darwin Day are really promoting an anti-God religion. The evolutionary worldview is an attempt to explain the universe and life without God. It’s a religion of naturalism and atheism. Sadly, many Christians buy into this religion and simply squeeze God into the gaps somewhere. By doing this, it is really no different than the Israelites who adopted the idolatry of the pagan nations and added it to their religious system.
He is against even attempting to explain the world without God. This, of course, denies the world view of anyone who does not share his particular faith.
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Brad Crouch should be fired. At the very least he should never write a science news article again (well, maybe after remedial education and appropriate penance). At first I thought perhaps he was a general or fluff journalist taken off the dog show beat and asked to cover a science news item, but his byline for The Advertiser (an Australian news outlet) says he is a “medical reporter.” That’s frightening.
I read a lot of bad science news reporting, but rarely does a reporter so thoroughly misrepresent the actual science news – unless there is an obvious ideological agenda, but as far as I can tell this is just pure incompetence.
He is reporting on a review article on epigenetics recently published in Science. The two articles have very little in common, and it’s difficult to see how Crouch arrived at his story other than just making shit up. He begins:
LANDMARK Adelaide research showing that sperm and eggs appear to carry genetic memories of events well before conception, may force a rethink of the evolutionary theories of Charles Darwin, scientists say.
First, the paper is not research, let alone “landmark” research. It is a review article. It’s not even a systematic review or a meta-analysis, which a reporter might be forgiven for calling a “study” – it’s just a discussion of the topic of epigenetics.
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