Creationism in Crisis - How Killer Whales Were Evolving Cultural Groups - 20,000 Years Before 'Creation Week'

Researchers find 20,000 years old refugium for orcas in the northern Pacific - SDU

The northern Pacific near Japan and Russia is home for several different groups of orcas. They have no contact with each other, do not seek the same food, do not speak the same dialect, and do not mate with each other. Some are the descendants of a pod that moved there during the last Ice Age.

Any study of whales, such as dolphins and they larger cousins, the orca's or killer whales will quickly dispel one of the myths creationists use to try to justify their absurd belief that humans are somehow materially different to the rest of life on Earth in a way which isn't just because we are a variation on the general mammalian theme with enough distance between us and related species to justify a separate taxon, because we were specially created - humans form cultures and have languages and traditions, etc.

Of course, it's not just the whales that have cultures and languages; chimpanzees and bonobos and other primates also have distinct cultural groups that differ significantly from one another, but this article deals specifically with orcas and the research which has shown that they moved into Ice Age refugia at the last glacial maximum, some 20,000 years ago, and some have slayed there ever since.

The article also illustrates a problem of modern taxonomy in how to define a species with hard and fast rules when the distinction in reality is fuzzy. Some of the pods studied form isolated cultural groups that seek different foods to the others, which speak a different dialect, move in a specific area, and never interbreed. This cultural barrier to hybridization is as much a barrier as is the different plumage and mating rituals that are the pre-zygotic barriers to interbreeding that justify classifying many related birds as distinct species because the barriers ensure an isolated gene pool in species that could successfully interbreed and do so in captivity. Killer whales exist in many pods with cultural barriers to interbreeding and so form isolated gene pools, yet they are regarded as a single species.

To overcome this problem, biologists have classified the different killer whale pods into 'ecotype', but it is this genetic isolation that enables genetic analysis to determine how long the pod has been isolated.

A research team led by whale biologist, Olga Filatova, of the University of Southern Denmark recently published an open access paper in the journal Marine Mammal Science showing how environmentally stable marine regions may have preserved refugial populations of the killer whale that retained historical genetic and cultural diversity. These whales are believed to have moved into the warmer refugia during the last Ice Age.

The team's work is explained in a University of Southern Demark (SDU) press release by Birgitte Svennevig:

Trust in The Clergy Falls To An All-Time Low in USA

Joel Osteen

Church of the Almighty Greed

Ethics Ratings of Nearly All Professions Down in U.S.

According to the latest Gallup Poll, trust in the ethical standards of almost all identified professional groups in the USA has declined in the four years up to 2023 with trust in the clergy reaching an all-time low at 32 percent of those polled rating their trust in them as very high or high. The clergy now rank alongside chiropractors and psychiatrists in the public perception of their ethical trustworthiness.

All the 5 major professions in the USA fell steadily between 1976 when polling began but the profession which fell furthest and fastest was that of clergy. in 1977, 61 percent of adult Americans polled, gave their trust in clergy as very high or high; this has now fallen to 32 percent, a 29 percentage points decline to almost half what it was in 1977.

And this downward trend has accelerated since 2012, declining by an average of slightly over 1.8 percentage points per year, against an average of just over 0.38 percentage points between 1977 and 2012. This represents about a four-fold increase in the rate of decline which, projected forward, if this rate continues, no-one in America will rate the ethical trustworthiness of clergy as very high or high by mid-2032.

Unintelligent Design - The Heath Robinson Way Legumes Get Nitrates

Image by Miha Creative/Shutterstock

Mechanism of Plants Obtain Nitrogen by Supplying Iron to Symbiotic Bacteria | Research News - University of Tsukuba

Creationism's 'intelligent' designer is nothing if not inventive. In fact, it's so inventive that it keeps on reinventing things it's already invented and designing new ways to do things it's already designed a way to do. It's almost exactly like it has no way of remembering what it did yesterday and using those designs and inventions today - a bit like a motor-car manufacturer who reinvents the wheel, or the steering mechanism every time it designs a new model.

Take, for example, the way most plants obtain the essential nitrates they need to make proteins. Nitrogen is abundant in the atmosphere (about 79%) where it exists as diatomic molecules N₂, in which form plants can't assimilate it. Instead they depend on soil bacteria, the 'nitrogen-fixing' bacteria such as Azotobacter and Clostridium which convert N₂, into ammonium (NH₄⁺ which forms salts with other minerals in the soil, in which form it can be taken in through the roots of plants. Apparently, it was too simple to give plants the same metabolic pathways that the nitrogen-fixing bacteria have so they could make their own ammonium, so a more complex and less energy-efficient way to get nitrates into plants had to be invented.

A small amount of ammonia (NH₃ is also produced by the action of lightening on atmospheric nitrogen and this, together with nitrates produced by industrial pollution is dissolved in rainwater and finds its way into the soil. Other bacteria, fungi and other soil organisms also release nitrates from decaying plant and animal matter in the soil.

Unintelligent Design - How A Design Blunder Causes Inflammatory Diseases, Especially In Later Life

Endosomes (magenta) collect around mitochondria (blue) after infection with virus HSV-1, which attacks mtDNA (green) and causes its release.

Credit: Salk Institute

Faulty DNA disposal system causes inflammation - Salk Institute for Biological Studies

In another example of the ramshackle Heath Robinson design process that created humans, scientists today published their findings that show how when a cell process goes wrong, as it frequently does, the result can be a serious health condition, causing suffering and unhappiness.

And of course, it’s another example of how we can tell humans weren't intelligently designed by an omnibenevolent god who wants to minimise the suffering in the world, but by a mindless, amoral natural process that has no option but to settle for the sub-optimal as long as it’s better than nothing.

The discovery, by researchers at the Salk Institute and their colleagues at UC San Diego , is the way when mitochondrial DNA (mtDNA) goes wrong and the cell tried to dispose of it, some of it leaks out into the cell, the cell’s immune system treats it like the DNA of a parasitic organism and sets up an immune response which caused inflammation.

Given the origin of mitochondria in our Heath Robinson contraptions we call cells, this is hardly surprising since mitochondria started out, probably as the free-living bacterial prey of another prokaryote, possibly an archaeon. They then became symbiotic, providing the cell with free ATP in return for protection and nutrients in the form of sugar, water and oxygen. Because they need to provide a handful of enzymes to do this with, and they are self-replicating, they retained a small amount of their original DNA while giving up most of it to the host cell's nucleus.

Creationism in Crisis - A New Endogenous Retrovirus Caught In The Act Of Invading a Genome

white-bellied mosaic-tailed rat Melomys leucogaster.
The species is being infected with the gibbon leukemia retrovirus.

Photo by Carlos Bocos

A rare recent case of retrovirus integration: An infectious gibbon ape leukemia virus is colonising a rodent’s genome in New Guinea - Leibniz Institute for Zoo and Wildlife Research

Researchers have discovered that a retrovirus is currently in the process of invading the genome of a rodent in New Guinea. This will add to the extensive list of known endogenous retroviruses. The virus, which appear to be harmless to the rodent - a mosaic tailed rat of the Melomys genus - is an infectious virus that causes leukemia in gibbons.

A retrovirus is an RNA virus that 'hides' in its host's DNA by inserting the DNA template for its RNA, using the enzyme reverse transcriptase that is coded for in its RNA. Once inserted it is replicated by every daughter cell. If it is inserted into the DNA of a germline cell, it can be passed on to the next generation.

Endogenous retroviruses (ERVs) are common in the genomes of all multicellular organisms and even some single-celled organisms, and as such constitute a large proportion of the non-coding or 'junk' DNA. A few may have been exapted for other purposes, but most are simply strands of viral DNA with a few mutations that broke them and rendered them harmless way back in our evolutionary history.

ERV's provide some of the most compelling evidence for common descent, especially since they appear at the same locus in the genomes of almost all members of a clade such as the vertebrates, including fish ancestors or the terrestrial vertebrates. The probability of the same ERV with the same mutations in in the same genetic locus to make it look like they form nested hierarchies, is vanishingly small, yet they do it over and over again.

The fact that they are present in all members of the same major clade tells us they must have been present in the last common ancestor of that clade, so they are a double embarrassment for creationists. They are both evidence of descent with modification and that there was no intelligence in the design of our genomes, because an intelligent designer would have no reason to include broken viral DNA which adds nothing by way of functionality yet must be replicated in every cell.

Unintelligent Design - How Scientists Are Overcoming The "Designer's" Incompetence

Credit: Dingzeyu Li via Unsplash

Systemic lupus erythematosus

World-first discovery may enable an effective long-term lupus treatment - Monash University

Readers may recall my recent article on Lupus and why women are nine times more likely to suffer from it than men, because the epigenetic process for switching off genes on their X-chromosome sometimes goes wrong and produces proteins that induce an immune response to their own tissues.

From a creationist perspective, this can only be for one of two reasons: either the designer was incompetent, or this was by design. The choice being either incompetence, or malevolence and misogyny.

Now a team of researchers at Monash University, Clayton, VIC, Australia, have reported success in finding a way to overcome this design defect - which begs the question: if scientists can do it, why couldn't an omnipotent intelligent designer? Could the answer be that the human immune system was not designed by an omnipotent, intelligent designer, but is the result of a mindless, utilitarian process that inevitably produces sub-optimal 'designs' that can't be scrapped and redesigned?

But that is the kind of thought that would cause panic in the mind of most creationists because it would raise the terrible spectre of wondering if they could be wrong.
The Australian team have just published their results, open access, in Nature Communications. They are also explained in a Monash University news release:

Creationism in Crisis - How A Pterosaur Flew Like A Bird On The Wing, Over The Sea To Skye - 165 Million Years Before 'Creation Week'

Reconstruction of Ceoptera evansae.

© NHM & Witton 2021

Skeleton of the new pterosaur Ceoptera evansae from the Middle Jurassic of the Isle of Skye.

Trustees of the Natural History Museum London

---

3D models of skeleton.

Natural History Museum London

February : New species of Jurassic pterosaur discovered | News and features | University of Bristol

In another of those casual refutations of the creation myth in the Bible, archaeologists have discovered a new species of pterosaur that flew in the skies of what if now the Isle of Skye, Scotland, about 165 million years before creationism's fabled god decided to magic up out of nothing, a small flat planet with a dome over it in the Middle East.

They are thought to have lived for some 5 million years between the late Early Jurassic up to the Late Jurassic.

The fossilised skeleton fills another of those gaps in the fossil record so beloved of creationist, where the scarcity of fossils meant that the evolution of pterosaurs was poorly understood. This fossil shows that all the main clades of pterosaurs had evolved before the end of the Early Jurassic and earlier than previously thought.

The team from the University of Bristol Natural History Museum, the University of Leicester, and the University of Liverpool have named the new species, Ceoptera evansae: Ceoptera from the Scots Gaelic word Cheò, meaning mist (a reference to the Gaelic name for the Isle of Skye, Eilean a’ Cheò, or Isle of Mist - Scots Gaelic is still widely spoken on Skye), and the Latin -ptera, meaning wing. Evansae honours Professor Susan E. Evans, for her years of anatomical and palaeontological research, in particular on the Isle of Skye.

Unintelligent Design News - A Newly-Discovered Virus-Like Particle That Doesn't Appear to Do Anything Other Than Replicate Itself

Streptococcus sanguinis bacteria, which live in the mouth, may host replicators named obelisks

UK Health Security Agency/
Science Photo Library

Figure 2.

Obelisks encode putatively well-folded proteins
a) Obelisk open reading frame 1 (Oblin-1) is predicted (total mean-pLDDT ± SD = 83.8 ± 13.4, see methods) to fold into a stereotyped N-terminal “globule” formed of a three alpha helix (orange) bundle partially wrapping around an orthogonal four helix bundle, capped with a beta sheet “clasp” (blue, globule mean-pLDDT = 90.1 ± 8.7), joined by an intervening region harbouring the conserved domain-A (magenta) with no predicted tertiary structure, to an arbitrarily placed C-terminal alpha helix. “Globule” emphasised on the right. b) a to-scale (secondary structure) topological representation of Oblin-1 with the “globule” shaded in grey, and the domain-A emphasised with this bit-score sequence logo (see methods). c) Obelisk Oblin-2 is confidently predicted (mean-pLDDT = 97.1 ± 4.6 ) to fold into an alpha helix which appears to be a leucine zipper. Sequence logo of an “i+7” leucine spacing emphasised in red, with hydrophobic “d” position residues emphasised in yellow (expanded in Supplementary Figure 4b). d) homo-multimer predictions of Obelisk-alpha Oblin-2. top: dimer (mean-pLDDT = 94.6 ± 0.6), bottom: trimer (mean-pLDDT = 93.6 ± 0.6). Side-on representations of homomultimers shown with numbers of inter-helix salt-bridges (see Supplementary Figure 5).

A new virus-like entity has just been discovered – ‘obelisks’ explained

At least with most of creationism's putative 'intelligent' designer, there is something that they appear to be for, other than simply reproducing themselves - even if it is, in the case of viruses and bacteria, increasing the suffering in the world by making other organisms sick.

But scientists have just discovered a small particle that seems to be in the edge of life, less so even than a virus, which doesn’t appear to do anything other than replicate, although it seems to need bacteria in which to do this. It’s not clear what harm it does to its bacterial host or even if it has some symbiotic function. But it appears to be almost everywhere, especially in our mouths and gut, where it appears to have speciated into several different forms. The team have named it 'obelisk' because it forms a rod-like shape.

It was discovered by a team of Stanford University researchers led by Andrew Z. Fire, a previous recipient of the 2006 Nobel Prize for Physiology or Medicine who have reported to have 'identified 29,959 Obelisks (clustered at 90% nucleotide identity), with examples from all seven continents and in diverse ecological niches'. Their report has been provided with free access ahead of peer-reviewed publication, in the preprint server, bioRxiv.

The question remains, what do these particles do exactly and are they potentially harmful, or are they beneficial in some way? At least one of their hosts in which they replicate is one of the bacteria responsible for the plaque on our teeth that is responsible for dental caries and gum disease that can result in lost teeth, Streptococcus sanguinis.
Like most viruses, obelisks are a single, circular strand of RNA, but unlike viruses, they don't have a protein coat. They have one and maybe two genes which code for proteins named 'oblins' which are unrelated to any other known proteins. In this respect they differ from other recently (1970) discovered free-living strands of RNA called viroids, which don't have any recognisable genes but are known to cause serious diseases in plants.

In the following article, reprinted from The Conversation under a Creative Commons license, Professor Ed Feil, Professor of Microbial Evolution at The Milner Centre for Evolution, University of Bath, explains the significance of this discovery. His article is reformatted for stylistic consistency:

Unintelligent Design - How Scientists Are Learning to Do What Creationism's 'Intelligent' Designer Found Too Difficult - Or Didn't Want To Do!

The proteins needed to create limb progenitor cells are marked with different colors under a microscope.

Images: Yuji Atsuta/Tabin lab

The proteins needed to create limb progenitor cells are marked with different colors under a microscope.

Images: Yuji Atsuta/Tabin lab

The Surprisingly Simple Recipe for Starting to Grow a Limb | Harvard Medical School

Visit any site of a supposed Marian miracle, such as Lourdes, now selling 'miracle cures' that almost never work and those that do can be attributed to the medication the pilgrim was receiving prior to the visit, or to spontaneous regression, the placebo effect or a psychosomatic condition, and you may find lots of crutches supposedly left there as testament to the cure of mobility disorders, but what you will never find is the artificial limb discarded by someone who had a spontaneous regeneration of an amputated limb.

Or visit any of the lucrative travelling, carefully stage-managed 'faith healing circuses' where people appear to be 'cured' of all manner of ailments at the touch of a 'healer', who, for perhaps obvious reasons, never works in a hospital, and you will never witness the regeneration of a limb, or even part of a limb. Not even a finger or toe.

And before some-one cites, the 'Miracle of Calanda', this is such an obvious hoax that it's a miracle anyone believes it.

Despite having allegedly created a universe from nothing and all living things from dirt, creationism's god appears to be incapable, even with the help of his miracle-working mother, to be able to regrow a human limb.

The problem is one of the designer's own making (if you believe creationists) because it would involve the epigenetic resetting of the cells at the end of the stump, so they become stem cells again, capable of making all the different specialist cells in a limb, like bone, muscle, skin, nerves and blood vessels and growing to the right shape in the right place. That was a once-only ability in the developing embryo.

Epigenetics, as I have written about many times, is necessary because the cells of a multicellular organism replicate the same way our single-celled ancestors did - by replicating the entire genome every time in every daughter cell. But the benefit of multicellularity is that cells are specialised so only need a few genes, not the entire genome and having the wrong genes active in a specialist cell would be detrimental, so most of them need to be switched off by the epigenetic system. A problem which could have been avoided by any omniscient, omnipotent designer by just replicating those genes that were going to be needed by the specialist cells, but not something a mindless, natural process with no foresight, no reverse gear and no means of scrapping a bad design and starting again, could have avoided.

And yet medical scientists investigating the problem believe they have discovered the basic principles involved, which turn out to be "surprisingly simple", so well within the capabilities of even creationism's rather limited god.

The scientists, led by Harvard Medical School geneticists, have published their findings in an open access paper in a Cell Press journal, Developmental Cell and explain it in a Harvard Medical School news release by Stephanie Dutchen:

Creationism in Crisis - Scientists Are Understanding More About How Plants Evolve and Diversify - No God-Magic Required

Top Left: Penstemon newberryi
Bottom Left: Penstemon cardwellii

Top Right: Penstemon rupicola
Bottom Right: Penstemon cerrulatus

Ecological Diversification in an Adaptive Radiation of Plants: The Role of De Novo Mutation and Introgression | Molecular Biology and Evolution | Oxford Academic

An effective way to refute the counter-factual claims of a wackaddodle cult like creationism is simply to reveal the facts and show how different they are to the cult beliefs. Sadly, this approach won't convince many creationists of course, especially those too arrogant to think their beliefs can be contradicted with mere facts, because part of being a creationist is to hold the self-idolatrous belief that your beliefs are inerrant, so trump anything science can produce, but one can but try.

In fact, researchers in biomedical sciences don't even try, they have more important things to do than try to convince fools who reject evidence before they see it and who are proud of the fact that nothing can make them change their minds. Scientists just discover the facts and add to the mountain of evidence that creationists have been conditioned to ignore or dismiss as lies or otherwise relegate to the realm of the unimportant.

For example, this week’s edition of Oxford University Press' journal Molecular Biology & Evolution has 10 different open access papers dealing with the minutia of evolution and not one of them shows any sign that the scientists are abandoning the Theory of Evolution as not fit for purpose and adopting instead, creationism's childish superstition complete with magic and unproven supernatural entities, as creationist cult leaders regularly tell their dupes.

None of these papers mention creationism or point out how the research findings refute it, of course, because they are written for people who understand the science, so don't need that to be pointed out to them. These are:

Creationism in Crisis - A Strange Shaped Tree 360 Million Years Before 'Creation Week'.

Enigmatic fossil plants with three-dimensional, arborescent-growth architecture from the earliest Carboniferous of New Brunswick, Canada: Current Biology

Creationism's designer is not known for creating a design then sticking to it. If you believe creationists, it has designed something like 500,000 beetles, for example, and, although they all do basically the same thing, hundreds of different trees.

And, if you believe creationist mythology, it created almost everything on Earth, hundred, even thousands of millions of years before it created the small flat planet with a dome over it, centred on the Middles East. Sadly, the Bronze Age story-tellers who wrote about it were oblivious of what had been living 360 million years earlier in the Tournaisian age in what is now New Brunswick, Canada, so said nothing about it in their tales. They said nothing about Canada either for that matter, because they were ignorant of anywhere outside their small area of the Middle East, as can be seen from the naive way they describe their world as they imagined it.

Had they been better informed though, they might have mentioned one of the more bizarre tree designs which consisted of a straight trunk about 15 feet tall, with long thin leaves radiating out from the top third and measuring about 18 feet in length, the whole thing resembling a giant green bottle brush. It doesn't appear to have had any branches.

Fossils of this tree have been described by an international team led by Robert Gastaldo of Colby College in Waterville, Maine, USA in collaboration with Matthew Stimson and Olivia King of the New Brunswick Museum, Saint John, and Saint Mary's University in Halifax, Nova Scotia, Canada, and others.

Their work is published, open access, in Current Biology and described in a Cell Press article reprinted in Science Daily:

Unintelligent Design News - Why Women Are More Prone To Lupus Than Men - Evolution, Or Does Creationism's God Just Hate Women More?

The classic 'butterfly rash' of systemic lupus erythematosus (SLE)

Lupus and other autoimmune diseases strike far more women than men. Now there's a clue why

In my days as an operational paramedic, I once had to move a 26 your old women to hospital because lupus had made her so ill her blood pressure was below the safe level to maintain her renal function.

It was so low I couldn't even sit her up to carry her down stairs without her losing consciousness, so I had to run a couple of units of IV fluid into her to bring it up enough to make it safe to move her. She really was profoundly ill and at death's door. But such was the nature of the profession that, having delivered her safely to hospital and handed her over to the care of doctors and nurses, that was the end of my role in her care, so I never heard the outcome.

The autoimmune condition, lupus erythematosus, is caused by a malfunction of the immune system in which something triggers it to turn against the sufferer's own body instead of the invasive pathogens from which it has evolved to protect us. Although, of course, a creationist would hotly dispute the idea that a system like our immune system evolved at all, and would insist that it was intelligently [sic] designed by their favourite, evidence-free, supernatural deity without whom nothing can be created, presumably because they believe chemistry and physics don't know how to behave without a magic god telling them.

But an intelligently-designed immune system would only malfunction and turn against the person it is supposedly designed to protect if it were either incompetently designed or malevolently designed and is doing what it was designed to do - randomly increasing the suffering in the world. The evidence is that lupus is far more common in women than in men by a ratio of 9:1, which begs the question, does the designer just hate women more than men or was he more diligent when designing men's immune system then when designing women's?

The answer, as anyone who understands anatomy and physiology and particularly, evolution, will tell you, is that as an evolved system, we can expect compromises and a lack of perfection because evolution is a utilitarian process with no foresight and no reverse gear, so we are stuck with a sub-optimal immune system that evolved in an ancient ancestor, maybe even a pre-vertebrate ancestor. Certainly, all known vertebrates have one, and some, like that of bats, is far superior to ours.

Now a team of researchers at Stanford University School of Medicine, Stanford, CA, USA have worked out why lupus is far more common in women than men. Ther results are published, open access, in Cell and explained in a Stanford Medical news release. But first, a little AI background:

Malevolent Designer News - Creationism's Divine Malevolence Has Just Released An E. Coli Upgrade With Added Malice

Escherichia coli

New and highly infectiousE. coli strain resistant to powerful antibiotics - University of Birmingham

Escherichia coli is a pathogenic bacterium that is loved by creationists because they have been taken in by Michael J. Behe's book, Darwin's Black Box, that made him a millionaire because so many creationists bought it (though few appear to have read it) and which they love to wave around as 'proof' that the locally popular god exists.

Behe, a leading light in the Deception Institute, which was set up to try to win converts for fundamentalist, Bible literalist Christianity, by spreading disinformation about science, had argued, falsely, that the flagellum of E. coli must have been intelligently designed, since all the components need to be present for it to work (the 'irreducibly complex' fallacy) and it is too complex to have evolved in a single step because, so he claimed none of the components on their own could have given an advantage for natural selection to select for (which of course ignores genetic drift as a cause of evolution).

What Behe neglected to do was tell his readers that almost all the components of the flagellum and the proton pump that drives it, were present in a structure called the Type III Secretory system with which bacteria bind themselves to their host and kill them, and this could easily have evolved from simpler beginning over the billions of years that bacteria were evolving into their present forms.

Since its publication, Behe has been repeatedly told of the errors in it, and as a professional microbiologist, he should be aware of the growing body of research explaining how the E.coli flagellum evolved^{1,2, 3, 4, 5}, yet he refused to correct his errors in later editions and continues to promote and defend the misinformation in it, whilst pocketing the royalties from sales, in a classic case of bearing false witness.

Creationism in Crisis - How Our Need For Vitamin D Was A Bad Design That Went From Bad To Worse

Permanent Central Maxillary Incisors showing evidence of Vit. D deficiency.

Fig 3. Permanent central maxillary incisors of CL 66.
Plane form hypoplasia is exhibited on the occlusal and labial surfaces.

Archaeological evidence of seasonal vitamin D deficiency discovered | University of Otago

The human need for vitamin D to ensure proper bone growth and development and various other health-related needs, is an example of how we were not intelligently designed but are the result utilitarian evolutionary compromises that balance benefit against detriment and that balance depends on the environment in which we evolved. It shows that we evolved in sunny climates where the sun comes directly through the atmosphere as it does in the tropics, rather than obliquely, as it does in the northern and southern parts of the globe.

We do not generally get enough vitamin D from our diet, so we need to manufacture it in our skin by the action of sunlight, in particular the ultraviolet B (UVB) spectrum. However, UVB sunlight is also harmful, so our skin needs to be protected from it with the pigment, melanin, which gives our skin its varying shades of brown or black. Generally, the darker the skin, the better protection it has from UVB but the less it can produce vitamin D.

This AI explanation outlines the problem: