Category Archives: Darwin

Sensory Worlds Beyond Our Imagining

An Immense World; How Animal Senses Reveal the Hidden Realms Around Us, Ed Yong, Random House/Bodley Head, June 2022

This book is an enormous achievement. A thrilling read, taking us into the Umwelt, or perceptual world, of numerous mammal, fish, reptile and insect species. A major work of scholarship, with over a thousand references to a 45-page bibliography, as well as accounts of interviews with numerous researchers and visits to their laboratories. An exploration of many ways of sensing the world, some of which we share, while others are beyond our imagining. The evolving interplay of perception and action, communication and deception, environment and response. And an enhanced insight into what it is like to be a bat, a bird, a blue whale, a beetle, or a human.

From the wealth of detail in the book, a consistent grand narrative emerges. Some physical process interacts with living matter. This is the raw material for sensation. Sensory abilities then shape a creature’s Umwelt, being developed according to the demands of its environment. But every perceiver is itself an object of perception to others, and we have colour displays and camouflage, smells as signals and identifiers, sound as communication to others and, by echolocation, back to the creature who generates it, and the same is true of other senses that we do not share, such as the detection of tiny electrical fields. Senses combine and even, we suspect, merge, and what we ourselves perceive is but part of an immense pattern. But the heedlessness with which we amplify our own signals disrupts this pattern, contributing to our destruction of nature, and we ourselves are the poorer for it.

Let me offer a few samples from the book’s wealth of detail.

Yong starts with taste and smell, two ancient senses that operate by direct molecular contact. It is not long before he surprises us. Snakes use their forked tongues to smell in stereo. Humans are poor compared with other mammals at detecting smells at low levels, but are rather good at telling different smells apart. No one knows how smell relates to chemical structure (contrast this with how seeing relates to the wavelength of light, hearing to frequency, or touch to pressure). As every well-trained dog-owner knows, smell is central to the Umwelt of dogs, but I would never have guessed that the same is true of elephants. And the molecules involved in smell include opsins, which are central to vision. As Yong puts it, in a way we see by smelling light.

File:Ed Yong.JPG
Ed Yong on a tardigrade, in Micropia, via Wikimedia

It is sometimes said that dogs, and most other mammals, are colour blind. This is only half true; they have just two kinds of colour receptors, while we (like other apes, and our cousins the Old World monkeys) have three.[1] The colours that we perceive arise from subtle interactions between these receptors. Thus some neurons are excited by blue cones but inhibited by red or green, while others are stimulated by red but inhibited by green. So the colours are we experience are the result of a kind of neuronal arithmetic, below the level of conscious awareness. I still feel surprise when someone superposes red and green beams of light on a screen, and I see the result as pure yellow. Our colour vision can be represented by a triangle, with red, blue, and green at the corners, and yellow halfway along one edge.

But hummingbirds, like many birds and reptiles, can see four kinds of colour; red, green, blue, and UV. If human colour vision can be represented by a triangle, that of a hummingbird is a pyramid. And while for us the overlap of red, green, and blue are enough to produce white, four kinds of sensor need to be activated to look white to a hummingbird.

Among humans, different individuals have slightly different sensitivities, and some women show a degree of four-colour vision, having inherited different pigments from the sites on their two separate X chromosomes that are responsible for colour vision. Words cannot convey this added perceptual dimension, but the fact that they really do have four-colour vision can be demonstrated by discrimination tests. (This by the way answers a philosophical riddle that intrigues me. How do I know that you are seeing colours the same way that I am? It turns out that there is a real chance that you aren’t.)

Many flowers that appear white to us are coloured in the UV, and appeal to insect pollinators with green, blue, and UV three colour vision. And UV vision evolved in insects long before there were flowers, so the flowers evolved the pigments to attract the pollinators.[2] Thus the ability to see directly influences the evolution of what is there to be seen.

Temperature detection overlaps other senses. There are sensors that can detect hot or cold temperatures, but can also be stimulated in different ways. The sensor for painful heat can be activated, on the skin as well as in the mouth, by habanero peppers, while menthol feels pleasantly cool in the mouth or the smoker’s throat. Menthol also happens to be addictive.

The ability to detect heat at a distance is useful to species that suck blood, from bedbugs and mosquitoes to vampire bats. Ticks can detect body heat from up to 13 feet away, and common insect repellents work with them, not by interfering with smell, but by blocking the heat sensors. These sensors are in spherical pits on their legs, and the pits are covered by a film with a hole in it. So the sensors give directional information as well as detecting the heat source. Rattlesnakes and other pit vipers also have pits with a narrow opening, falling on a sensing membrane that carries around 7000 nerve endings. They can detect the presence and approximate direction of an increase in temperature of 0.001oC, which means that a viper can locate a rodent 1 m away. Information from the temperature sensing pits is combined with information from the eyes, so maybe for them the sense acts as an adjunct to vision, rather than on its own.

Touch organs can be modified for special purposes. The emerald jewel wasp paralyses cockroaches by stinging their brains, and has a touch sensor at the end of her sting to locate the exact location. A wide range of mammals, including the opossum, a marsupial, as well as rats and mice, use touch sensors at the base of whiskers to explore their surroundings several times a second. Since each whisker has its own connection to the somatosensory cortex, this builds up a map of the surroundings. So whisking, as it is called, is perhaps more like seeing than like touch. It would seem to be a very ancient trait indeed, since the last common ancestor of placentals and marsupials was back in the age of dinosaurs. The whiskers of seals are so shaped and angled as to minimise the forces on them as they move through the water, which would otherwise overpower the pressure waves caused by passing fish.

Sound detection is fast, precise, 24 hour, and useful for detecting predators or prey. Sound is also used in communication, as in the finding and assessment of mates. But mating calls come at the cost of giving away one’s location. There is a species of parasitic fly that has developed ears remarkably similar to those of the crickets it preys on, to eavesdrop on their mating calls. On Hawaii, which was once seriously infested by such flies, the crickets have fallen silent. Once again, the overlapping Umwelten of prey and predator drives evolution.

Surprisingly, the first insects were almost certainly deaf, since hearing has evolved separately among them at least 19 different times, on many different parts of the body, having in general been developed from organs that respond to vibration and pressure.

We can only detect parts of how animals use sound to communicate. Birdsong contains more structure than the human ear can resolve, unless it’s played back slowly. In fact, the structure within each note may be more important to the birds than the order that the notes are played in. Whales and elephants both use what we call infrasound, vibrations too low in pitch for our ears to hear, as a way of keeping in touch over long distances. Mice, however, communicate using ultrasound, frequencies too high for us to detect. The terms infra and ultra are arbitrary, relating to our own capacities, but since we are deaf to such sounds they were not even detected, let alone studied, until a few decades ago, and may be much more important in nature than we realise.

Echolocation in particular may be much more extensive than our knowledge of it, when it uses frequencies that our own ears cannot detect. Even bat echolocation, although suspected much earlier, was not clearly demonstrated until 1938. It enables bats to navigate and catch insects in complete darkness. This is an impressive feat; the bats need to generate short pulses of high-frequency sound, and then detect the direction and timing of the faint echo from a small moving target. Some bats can even tune their ears to respond to a frequency slightly different from the one they are emitting, and detect the movement of their prey using the Doppler effect. [3]

But moths are not merely passive prey. They have ears that can detect bat cries, and dodge and loop to evade capture. Tiger moths produce clicks of their own, which confuse the bats. Some moths even have long flexible tails at the end of their wings, which may also add to the confusion.

Infrasound echolocation by dolphins was detected in the 1950s, and since the 1960s the U.S. Navy has been training them to find sunken equipment and mines, and aiming to reverse engineer their abilities. Humans avoid walking into obstacles using echolocation, and some blind people have developed this to a high skill, building up a model of the world in their visual cortex, in much the same way that most of us do so using sight.

Darwin was puzzled by so-called electric eels, which use electric shocks to stun their prey. After all, evolution regards present organs as the result of a series of incremental improvements, but what use would the electric organ have been in its feeble first stages of development? It took a century to find the answer. Many fish possess a lateral line, sensitive to pressure, and in some cases this has been modified to detect electricity. This confers an obvious advantage, since any living thing moving through water generates tiny electric currents. And electrodetection gains in sensitivity and acuity when combined with the ability to generate one’s own more powerful electric field. So we have passive electroreception and active electroreception, just as we have hearing and the use of echoes. The cells that detect the electrical fluctuations are hair cells, basically similar to the same cells that detect pressure waves on the lateral line, or pressure oscillations in our own ears. Active electroreception operates in every direction, will work as well in cloudy as in clear water, and is so sensitive that some fish can be trained to detect the difference between a clay pot full of river water, and one also containing an insulating glass rod.

Passive electroreception is extremely widespread among vertebrates, being used by sharks, catfish, and salamanders, while the platypus has over 50,000 electroreceptors in its bill. Bumblebees can detect the electric fields that surround flowers, and it may well be that electroreception is much more common than we as yet realise among insects, equipped as many are with touch- and current-sensitive hairs.

Yong concludes his list of the senses with the ability to detect magnetic fields. This is a difficult area, if only because magnetic effects are extremely weak, and show subtle variations on a global scale in direction, intensity, and angle of dip relative to the surface. To complicate things further, no one even knows what the magnetoreceptor would look like or how it operates. Some bacteria grow small crystals of magnetite, and can distinguish North from South, but no one has managed to find similar structures in the birds and animals that are known to use magnetic fields as an aid to migration. One current theory invokes what are called radical pairs, molecules raised to high-energy states by the influence of light, but such states are short-lived, and I as a chemist would require a lot of convincing.

Senses interact. Mosquitoes are attracted by body warmth, but only if they can smell carbon dioxide. Electric fish that have learnt to distinguish shapes using their electric sense are then able to do so by sight, and vice versa. I have already mentioned how the mental maps constructed by blind people, who have learnt to navigate using echolocation, reside in the visual cortex. And finally, we need to remember that sensation requires discriminating between the signals that come to an organism from outside, and those that it generates by itself.

So all complex animals, including ourselves, perceive only a small part of the immense world of possible sensations, and construct their own Umwelt from the part accessible to their own senses. But we show brutal insensitivity in how we influence this world. We brighten the night sky and blur the distinction between the seasons, confuse forest insects with the sound from our machines, scatter huge amounts of material that must distract the sense of smell, and make the very oceans reverberate, so that whales navigating by infrasound end up stranding themselves in response to naval sonar.

And when did you last see the Milky Way?

***

Ed Yong’s earlier book, I contain multitudes: the microbes within us and a grander view of life, was a New York Times bestseller, and in June 2021 he received a Pulitzer Prize for Explanatory Reporting for his writing on the COVID-19 pandemic

***

1] Red colour perception evolved by accidental duplication of the gene that codes for the green-sensitive receptor, followed by Darwinian selection for a new use – the ability to detect ripe fruit, or tender young leaves, against a green background. A nice example of how evolutionary change generates new information.

2] Yong does not tell us how we know this, and to do so would have required a chapter in itself. But, in brief, the methods involve cross-species comparisons, and, these days, the use of molecular biology to reconstruct family trees for the relevant genes. The simplest assumption is then that a trait prevalent in one particular clade was present in its last common ancestor.

3] This is the familiar increase in the perceived frequency of a sound wave when the distance between source and observer is decreasing. Here the decrease is in the length of the round trip, from bat to target and back again, but with further fine tuning from the motion of the prey, and even the flapping of a moth’s wing has a detectable effect.

This post first appeared in 3 Quarks Daily

Darwin does devolve. Sometimes. So what?

“[T]here is in fact nothing that can alleviate that fatal flaw in Darwinism” says Professor Behe, stating the book’s central claim in the mendaciously mislabelled creationist web journal Evolution News.

The claim is clickbait, the book title misleading, and the argument long since rebutted. The historical roots of the argument show the close links between what now calls itself Intelligent Design, and biblically inspired “creation science”. The issues are important because the Intelligent Design movement gives a veneer of intellectual respectability to the denial of scientific reality. Read the rest of this entry

Teaching evolution to creationists in Kentucky (by one who does it for a living)

Evolution and scientific logic lie at the heart of Prof Jim Krupa’s award-winning biology course at the University of Kentucky, conveyed by a mixture of story-telling, the Socratic method, and student engagement in a case study close to his heart as a naturalist. Jim has kindly agreed to let me post his article in Orion Magazine. The first part (here) describes the  hostile cultural environment in which he is working, why evolution is at the core of his teaching, and how he begins his course by clearing away semantic nonsense, and analysing the concept of scientific theory.

You will find more detail about this in one of his articles in The American Biology Teacher [1]. Jim uses the National Academies definition of a scientific theory as well-attested by observation, but, as he explains there, he is well aware of its limitations, and  anatomises “the” theory of evolution into its separate independent components, before bringing them to bear on the case study that I will be describing the second part of this two-part series.

Defending Darwin

By James Krupa

I’M OFTEN ASKED what I do for a living. My answer, that I am a professor at the University of Kentucky, inevitably prompts a second question: “What do you teach?” Responding to such a question should be easy and invite polite conversation, but I usually brace for a negative reaction. At least half the time the person flinches with disapproval when I answer “evolution,” and often the conversation simply terminates once the “e-word” has been spoken. Occasionally, someone will retort: “But there is no evidence for evolution.” Or insist: “It’s just a theory, so why teach it?”

File:WilliamtyounglibraryUK.JPG

University of Kentucky library building

At this point I should walk away, but the educator in me can’t. I generally take the bait, explaining that evolution is an established fact and the foundation of all biology. If in a feisty mood, I’ll leave them with this caution: the fewer who understand evolution, the more who will die. Sometimes, when a person is still keen to prove me wrong, I’m more than happy to share with him an avalanche of evidence demonstrating I’m not.

Some colleagues ask why I bother, as if I’m the one who’s the provocateur. I remind them that evolution is the foundation of our science, and we simply can’t shy away from explaining it. We don’t avoid using the “g-word” when talking about gravitational theory, nor do we avoid the “c-word” when talking about cell theory. So why avoid talking about evolution, let alone defending it? After all, as a biologist, the mission of advancing evolution education is the most important aspect of my job.

an institution steeped in the history of defending evolution education

TO TEACH EVOLUTION at the University of Kentucky is to teach at an institution steeped in the history of defending evolution education. The first effort to pass an anti-evolution law (led by William Jennings Bryan) happened in Kentucky in 1921. It proposed making the teaching of evolution illegal. The university’s president at that time, Frank McVey, saw this bill as a threat to academic freedom. Three faculty members—William Funkhouser, a zoologist; Arthur Miller, a geologist who taught evolution; and Glanville Terrell, a philosopher—joined McVey in the battle to prevent the bill from becoming law. They put their jobs on the line. Through their efforts, the anti-evolution bill was defeated by a forty-two to forty-one vote in the state legislature. Consequently, the movement turned its attention toward Tennessee.

File:Funkhouser building.jpg

The Funkhouser building. Funkhouser, then Professor of Zoology, was among those who successfully campaigned against a 1921 State bill that wold have made the teaching of evolution illegal.

John Thomas Scopes was a student at the University of Kentucky then and watched the efforts of his three favorite teachers and President McVey. The reason the “Scopes Monkey Trial” occurred several years later in Dayton, Tennessee—where Scopes was a substitute teacher and volunteered to be prosecuted—was in good part due to the influence of his mentors, particularly Funkhouser. As Scopes writes in his memoir, Center of the Storm: “Teachers rather than subject matter rekindled my interest in science. Dr. Funkhouser . . . was a man without airs [who] taught zoology so flawlessly that there was no need to cram for the final examination; at the end of the term there was a thorough, fundamental grasp of the subject in bold relief in the student’s mind, where Funkhouser had left it.”

I was originally reluctant to take my job at the university when offered it twenty years ago. It required teaching three sections of non-majors biology classes, with three hundred students per section, and as many as eighteen hundred students each year. I wasn’t particularly keen on lecturing to an auditorium of students whose interest in biology was questionable given that the class was a freshman requirement.

Then I heard an interview with the renowned evolutionary biologist E. O. Wilson in which he addressed why, as a senior professor—and one of the most famous biologists in the world—he continued to teach non-majors biology at Harvard. Wilson explained that non-majors biology is the most important science class that one could teach. He felt many of the future leaders of this nation would take the class, and that this was the last chance to convey to them an appreciation for biology and science. Moved by Wilson’s words, and with the knowledge that William Funkhouser once held the job I was now contemplating, I accepted the position. The need to do well was unnerving, however, considering that if I failed as a teacher, a future Scopes might leave my class uninspired.

I quickly came to the conclusion that, since evolution is the foundation upon which all biology rests, it should be taught at the beginning of a course, and as a recurring theme throughout the semester.

I realized early on that many instructors teach introductory biology classes incorrectly. Too often evolution is the last section to be taught, an autonomous unit at the end of the semester. I quickly came to the conclusion that, since evolution is the foundation upon which all biology rests, it should be taught at the beginning of a course, and as a recurring theme throughout the semester. As the renowned geneticist Theodosius Dobzhansky said: “Nothing in biology makes sense except in the light of evolution.” In other words, how else can we explain why the DNA of chimps and humans is nearly 99 percent identical, and that the blood and muscle proteins of chimps and humans are nearly identical as well? Why are these same proteins slightly less similar to gorillas and orangu­tans, while much less similar to goldfish? Only evolution can shed light on these questions: we humans are great apes; we and the other great apes (gibbons, chimps, gorillas, bonobos, and orangutans) all evolved from a common ancestor.

Soon, every topic and lecture in my class was built on an evolutionary foundation and explained from an evolutionary perspective. My basic biology for non-majors became evolution for non-majors. It didn’t take long before I started to hear from a vocal minority of students who strongly objected: “I am very offended by your lectures on evolution! Those who believe in creation are not ignorant of science! You had no right to try and force evolution on us. Your job was to teach it as a theory and not as a fact that all smart people believe in!!” And: “Evolution is not a proven fact. It should not be taught as if it is. It cannot be observed in any quantitative form and, therefore, isn’t really science.”

We live in a nation where public acceptance of evolution is the second lowest of thirty-four developed countries, just ahead of Turkey. Roughly half of Americans reject some aspect of evolution, believe the earth is less than ten thousand years old, and that humans coexisted with dinosaurs. Where I live, many believe evolution to be synonymous with atheism, and there are those who strongly feel I am teaching heresy to thousands of students. A local pastor, whom I’ve never met, wrote an article in The University Christian complaining that, not only was I teaching evolution and ignoring creationism, I was teaching it as a non-Christian, alternative religion.

There are students who enroll in my courses and already accept evolution. Although not yet particularly knowledgeable on the subject, they are eager to learn more. Then there are the students whose minds are already sealed shut to the possibility that evolution exists, but need to take my class to fulfill a college requirement. And then there are the students who have no opinion one way or the other but are open-minded. These are the students I most hope to reach by presenting them with convincing and overwhelming evidence without offending or alienating them.

a question I’ve heard many times: “If we evolved from monkeys, why are there still monkeys?”

Some students take offense very easily. During one lecture, a student asked a question I’ve heard many times: “If we evolved from monkeys, why are there still monkeys?” My response was and is always the same: we didn’t evolve from monkeys. Humans and monkeys evolved from a common ancestor. One ancestral population evolved in one direction toward modern-day monkeys, while another evolved toward humans. The explanation clicked for most students, but not all, so I tried another. I asked the students to consider this: Catholics are the oldest Christian denomination, and so if Protestants evolved from Catholics, why are there still Catholics? Some students laughed, some found it a clarifying example, and others were clearly offended. Two days later, a student walked down to the lectern after class and informed me that I was wrong about Catholics. He said Baptists were the first Christians and that this is clearly explained in the Bible. His mother told him so. I asked where this was explained in the Bible. He glared at me and said, “John the Baptist, duh!” and then walked away.

a biology colleague asked … if I would be teaching evolution as a theory or a fact.

To truly understand evolution, you must first understand science. Unfortunately, one of the most misused words today is also one of the most important to science: theory. Many incorrectly see theory as the opposite of fact. The National Academy of Sciences provides concise definitions of these critical words: A fact is a scientific explanation that has been tested and confirmed so many times that there is no longer a compelling reason to keep testing it; a theory is a comprehensive explanation of some aspect of nature that is supported by a vast body of evidence generating testable and falsifiable predictions.

In science, something can be both theory and fact. We know the existence of pathogens is a fact; germ theory provides testable explanations concerning the nature of disease. We know the existence of cells is a fact, and that cell theory provides testable explanations of how cells function. Similarly, we know evolution is a fact, and that evolutionary theories explain biological patterns and mechanisms. The late Stephen Jay Gould said it best: “Evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world’s data. Theories are structures of ideas that explain and interpret facts.”

Theory is the most powerful and important tool science has, but nonscientists have perverted and diluted the word to mean a hunch, notion, or idea. Thus, all too many people interpret the phrase “evolutionary theory” to mean “evolutionary hunch.”

Not surprisingly, I spend the first week of class differentiating theory from fact, as well as defining other critical terms. But I’m appalled by some of my colleagues who, despite being scientists, do not understand the meaning of theory. As I was preparing to teach a sophomore evolution class a few years ago, a biology colleague asked how I was going to approach teaching evolution. Specifically, he asked if I would be teaching evolution as a theory or a fact. “I will teach evolution as both theory and fact,” I said, trying hard to conceal my frustration. No matter. My colleague simply walked away, likely questioning my competence to teach the class.

Hear a conversation with James J. Krupa about his experience teaching evolution.

Read the rest of this entry

Behe demolishes Darwin (yet again!)

Michael Behe has a new book coming out, Darwin Devolves, which according to the mendaciously mislabelled Evolution News “Topples Foundational Claim of Evolutionary Theory.” I am unlikely to be sent a review copy, so I am relying on the Evolution News summary.

In brief, Behe continues to assert the existence of irreducible complexity in animal organs, while maintaining that

Darwinian evolution proceeds mainly by damaging or breaking genes, which, counter-intuitively, sometimes helps survival. In other words, the mechanism is powerfully de-volutionary. It promotes the rapid loss of genetic information.

and encapsulates this conclusion in what he calls the First Rule of Adaptive Evolution:

Break or blunt any gene whose loss would increase the number of offspring.

I reviewed Behe’s earlier statement of this Rule some years ago, in PandasThumb, and friends have suggested that I repost it. So here it is. (I am proud to say that it has already been reposted by Peaceful Science.

Since this First Rule of Adaptive Evolution, the pinnacle of Behe’s argument, was already spelt out in the earlier work, there is little that I need add to my original review below, beyond pointing out that even this puny statement of the obvious came with a debilitating disclaimer

It is called a “rule” in the sense of being a rule of thumb. It is a heuristic, useful generalization, rather than a strict law; other circumstances being equal, this is what is usually to be expected in adaptive evolution

and reminding Behe that he is himself the product of a massive increase in genetic complexity, the doubling and redoubling of the genome that separates him from his early notochord ancestors.  The original review follows [note: in that review I referred to “E.Coli acquiring the ability to metabolise citrate under anaerobic conditions”; that should be “aerobic conditions, in the absence of a reducing agent”. h/t Monica Lewis. this does not, however, affect the logic of the argument]:

Behe’s review in context, or what’s the point?

The Panda's Thumb Read the rest of this entry

The Scopes “Monkey trial”, Part 1: Issues, Fact, and Fiction

This weekend sees the 93rd anniversary of the Scopes Trial, and I am reposting this and its companion piece to celebrate.

I would point out two things. One is that the actual William Jennings Bryan was nothing like the ogre of Inherit the Wind, which was an allegory of McCarthyism. The other is how remarkably well the scientific evidence has stood up to almost a century of examination. There is even a mention, based on serological evidence, of how closely related whales are to hoofed land animals.

Primate's Progress

What is the purpose of this examination?

We have the purpose of preventing bigots and ignoramuses from controlling the education of the United States, and that is all.

DaytonCourthouse Dayton Courthouse today

Inherit the Wind, the prism through which the public sees the Scopes Trial, is a travesty. William Jennings Bryan, who prosecuted Scopes, was neither a buffoon nor a biblical literalist but moved by deep concerns that continue to merit attention. He did not protest at the leniency of Scopes’s punishment, but offered to pay the fine out of his own pocket. Nor did he collapse in defeat at the end of the trial, but drove hundreds of miles, and delivered two major speeches, before dying in his sleep a week later. Scopes, on trial for the crime of teaching evolution in Tennessee state school, was never at risk of prison. He was no martyr, but a willing participant…

View original post 4,086 more words

If you are interested in evolution, get this book

EVOLUTION: What the Fossils Say and why it Matters, Donald R. Prothero (2nd edition)

If you are interested in evolution, get this book. And make sure that your library gets it. And your children’s highschool library. Incidentally, it’s incredible value; list price $35.00/£27.95 from Columbia University Press, with over 400 lavishly illustrated pages.

The book is a comprehensive survey of the fossil record, supplemented at times with other evidence, and framed as one long argument against creationism. It opens with a general discussion of the ideas behind current evolutionary thinking, moves on to a survey of specific topics in (mainly animal) evolution, from the origins of life to the emergence of humanity, and concludes with a brief discussion of the threat that creationism poses to rational thinking. The argument is laid out clearly in the seemingly artless prose of an accomplished writer in love with his subject matter, with plain language explanations that presume no prior knowledge, while the detailed discussions of specific topics give enough detail to be of value, I would imagine, even to a professional in the field. The author is an experienced educator and researcher, with thirty books ranging from the highly technical to the popular, some 300 research papers, and numerous public appearances to his credit, and the work is copiously illustrated with photos, diagrams, and drawings by the author’s colleague, Carl Buell. These illustrations are an integral part of the work, graphically displaying the richness of the data at the heart of the argument. Read the rest of this entry

Creationist nonsense on geology; the odd case of Prof McIntosh D.Sc.

Image result for andy mcintoshCatastrophism versus gradualism; this controversy was laid to rest by TH Huxley in his 1869 Address to the Geological Society, but UK Young Earth Creationists persist in parading the corpse as if it presented a living challenge to current thinking. Perhaps it appeals to their absolutist binary mindset.

McIntosh himself is a member of the group mendaciously mislabelled Truth in Science, which distributed the equally mendacious neo-creationist tract Exploring Evolution to UK schools some years ago, and is an author of the error-saturated Origins, Examining the Evidence, published by that group. BCSE has published a detailed review of Exploring Evolution here.

This piece by my friend, the geologist historian Anglican priest Michael Roberts, will tell you more about McIntosh’s writing than you wish to know, but will convey a wealth of fascinating geological and historical information in the process.

Peddling and Scaling God and Darwin

THE GEOLOGY OF GENESIS FOR TODAY

Image result for andy mcintosh

One of the best selling British creationist books is Genesis for Today by Andy McIntosh, which is now in its 5th edition. https://www.dayone.co.uk/products/genesis-for-today

Most of the book is a popular exposition of Genesis 1 to 11 – and some of it I agree with, but not his insistence that it is literal history.

In Genesis for Today McIntosh gives three scientific appendices, which are much the same in the 1st and 5th editions.  I could either go through and nit-pick his geological errors or consider them under main headings. I have chosen the latter.

Image result

Most would think that a professor in a scientific discipline at a leading university (with a first-rate geology department) would be able to make a reasonable showing on geology.Many amateurs and non-geologists I’ve met in geological societies have a clear grasp.

From the whole of his book, other writings and…

View original post 2,117 more words

%d bloggers like this: