linkfest – 02/23/15

Stone Age skull from Kenya reveals astonishing human diversity“A partial human skull found at a site in Kenya suggests early humans living in Africa were incredibly diverse. The 22,000-year-old skull is not a new species and is clearly that of an anatomically modern human, but is markedly different from similar finds from Africa and Europe from the same time, the researchers said…. [T]he new findings suggest that during this early period of human history, Africa may have supported even greater human diversity, with small, offshoot lineages that no longer exist today….”

A New Theory on How Neanderthal DNA Spread in Asia“Researchers have discovered that Neanderthals interbred with the ancestors of Asians at two points in history, giving this population an extra infusion of Neanderthal DNA.”

Division of labor by sex and age in Neandertals: an approach through the study of activity-related dental wear“The study reveals that all individuals have cultural striations, but those detected on the adult females are longer than the striations found in adult males. Regarding the distribution of dental chipping, the prevalence of this trait is higher in the maxillary dentition of males whereas females have the majority of dental chipping on their mandibular teeth. T he differences detected on the overall activity-related dental wear pattern denote a difference or a division of labor by age and sex in Neandertals while using the mouth as a third hand, i.e., in activities other than the provisioning of food, and provide new evidence for the lifestyle of this Pleistocene fossil human species.” – h/t paleogenomics!

European languages linked to migration from the east“Large ancient-DNA study uncovers population that moved westwards 4,500 years ago.” — see also Massive Migration and Origins from greg cochran.

A story of 69 ancient Europeans – from dienekes. you need to read this one!

Genetic Characterization of Human Populations: From ABO to a Genetic Map of the British People – see map here @dienekes’.

Y chromosomes and Catalan surnames“‘By genotyping 17 Y-STRs and 68 SNPs in ~2500 male samples that each carried one of the 50 selected Catalan surnames, we could determine sets of descendants of a common ancestor, the population of origin of the common ancestor, and the date when such a common ancestor lived. Haplotype diversity was positively correlated with surname frequency, that is, rarer surnames showed the strongest signals of coancestry. Introgression rates of Y chromosomes into a surname by non-paternity, adoption, and transmission of the maternal surname were estimated at 1.5−2.6% per generation, with some local variation. Average ages for the founders of the surnames were estimated at ~500 years, suggesting a delay between the origin of surnames (twelfth and thirteenth centuries) and the systematization of their paternal transmission. We have found that, in general, a foreign etymology for a surname does not often result in a non-indigenous origin of surname founders; however, bearers of some surnames with an Arabic etymology show an excess of North African haplotypes.'” – @dienekes’.

Genetic evidence for an origin of the Armenians from Bronze Age mixing of multiple populations

Stone Age skeleton judged Norway’s oldest – 8000 years old.

Italic “Eteocretan” Sea peoples? – also @dienekes’.

Making Discoveries about Human Evolution Using 3D Technology

Make Love, Not Disease“New research on the genetic advantages of sexual reproduction has found that blending our genes through sex helps purge us of disease mutations.”

Human Genome Studies Reveal How Little Is Necessary To Explain the Human DNA Behind our Bigger Brains

Gene Changes Make Humans’ Sense of Taste Unique“Our ability to eat bitter plants help distinguish us from our ancestors and chimpanzees today.”

Dominance Genetic Variation Contributes Little to the Missing Heritability for Human Complex Traits – h/t gerome breen!

Elevated germline mutation rate in teenage fathers [pdf] – “We observe, as expected, that the overall mutation rate for fathers is seven times higher than for mothers. Also as expected, mothers have a low and lifelong constant DNA mutation rate. Surprisingly, however, we discover that (i) teenage fathers already set out from a much higher mutation rate than teenage mothers (potentially equivalent to 77–196 male germline cell divisions by puberty); and (ii) ageing men maintain sperm DNA quality similar to that of teenagers….” – h/t andrew sabisky! jayman tweeted: “8.2% false paternity rate in West Africans and 1.3% in Middle Easterners in this sample.”

Escape from crossover interference increases with maternal age – h/t billare! who tweeted: “Higher recombination rates in older women, being less concentrated in the usual hotspots. Men tend to stick w/theirs.”

Predicting and retrodicting intelligence between childhood and old age in the 6-Day Sample of the Scottish Mental Survey 1947“Terman–Merrill Stanford–Binet intelligence test scores at age 11 years correlated .72 with verbal intelligence at age 77. Adding another test from age 11 and educational took the multiple R to .81. National Adult Reading Test scores at age 77 and educational had a multiple R of .75 with IQ scores at age 11.” – h/t stuart ritchie! — see also Steady as she goes from dr. james thompson.

Peer effects: they exist but they’re not very big – from ben southwood.

Indian states: G and S factors – from emil kirkegaard.

State IQ estimates (2013) and 2013 IQ estimates by state, total and white only and State IQ estimates, blacks only (2013) and State IQ estimates, Hispanics only (2013) and IQ by race and parental educational attainment – from the awesome epigone.

Nailing liberalism / conservatism by the 50 U.S. States – from bryan pesta.

Low IQ ups risk of heavy drinking among men“The researchers analysed data collected from 49,321 Swedish males born during 1949 to 1951 and who were conscripted for Swedish military service from 1969 to 1971. IQ results were available from tests performed at conscription, and questionnaires also given at conscription provided data on total alcohol intake (consumed grams of alcohol/week) and pattern of drinking, as well as medical, childhood and adolescent conditions, and tobacco use. Adjustments were made for socio-economic position as a child, psychiatric symptoms and emotional stability and the father’s alcohol habits. ‘We found that lower results on IQ tests in Swedish adolescent men are associated with a higher consumption of alcohol, measured in both terms of total intake and binge drinking,’ Sjolund said.” h/t ruta akula!

Mathematical Proof Is Not Minutiae And Irreducible Complexity Is Not A Theory: A Final Response To Burt And Simons And A Call Tl Criminologists – from brian boutwell et al. brian tweeted: “Our second response to the call within Criminology to ban twin research.”

Familial Clustering of Tic Disorders and Obsessive-Compulsive Disorder – h/t amir sariaslan!

A two-dimensional model of psychopathy and antisocial behavior: A multi-sample investigation using items from the Psychopathy Checklist-Revised – h/t richard harper! who tweeted: “[P]sychopathy as fearless affect plus disinhibited lifestyle, then plus anti-social to get crime.”

Birds of a “bad” feather flock together: The Dark Triad and mate choice“[W]omen high in psychopathy considered the Dark Triad traits in potential male partners more physically attractive and desirable for an one-night stand, as well as a potential husband. Men who were high on psychopathy were likewise attracted to psychopathy in potential mothers.”

Cads and dads“Promiscuity and fidelity seem to be specific biological adaptations. Their manifestations in men and women are not as different as you might expect.” (whatever’s gotten into the economist these days?)

Genetic similarity between mates predicts extrapair paternity — a meta-analysis of bird studies

Who cares? Why evolution suggests parenting responsibility is seldom equally shared

Sex Differences in Preferences for Humor: A Replication, Modification, and Extension [pdf] – “[M]en prefer women who are receptive to their humor whereas women prefer men who produce humor. These findings held even after we modified Bressler et al.’s questionnaire for better conceptual validity. Furthermore, using a separate measure designed to assess trade-offs, we found that men viewed humor receptivity as a necessity and humor production as a luxury when they were asked to create an ideal long-term partner. For women, it was just the opposite.”

How Big are Psychological Sex Differences?“Sex Differences are Not Small if You Know Where to Look” – h/t claire lehmann!

Prenatal hyperandrogenic environment induced autistic-like behavior in rat offspring – h/t simon baron-cohen!

The influence of prenatal hormones on occupational choice: 2D:4D evidence from Moscow“Women in enterprising occupations exhibited lower measured 2D:4D ratios than average. Those in conventional and social work had higher 2D:4D ratios. Results confirm previous findings on 2D:4D and gender-specific occupational interests.”

Examining the Impact of Peer Group Selection on Self-Reported Delinquency: A Consideration of Active Gene–Environment Correlation – h/t jayman! who tweeted: “Do peers still influence adolescent delinquency after taking into account genetic influences? No.”

Socioeconomic status and sick leave granted for mental and somatic disorders: a prospective study of young adult twins“Low SES is associated with a higher level of sick leave granted for both mental and somatic disorders among young adults, but these associations are confounded by factors that are common to co-twins. Education and income are therefore not likely to strongly affect sick leave in young adulthood.”

List of genetic confounds – from emil kirkegaard.

Sibling differences in low birth weight, dopaminergic polymorphisms, and ADHD symptomatology“[L]ow birth weight siblings are at significantly greater risk of exhibiting symptoms of ADHD during childhood relative to their normal birth weight siblings. Moreover, possessing greater genetic risk on three dopaminergic genes (DAT1, DRD2, and DRD4) relative to a sibling appears to exacerbate the link between sibling differences in birth weight and sibling differences in ADHD symptomatology.”

What is different about the brains of “SuperAgers”“Compared with average elderly individuals, they found fewer Alzheimer-type neurofibrillary tangles and an increased packing density of von Economo neurons, especially in the anterior cingulate.”

“Bad genes” & criminal responsibility – MAOA stuff.

Heritability & the left“[T]here’s no conflict between leftism and a belief in the heritability of ability.” – that’s what i said! see also: Heritability, Left and Right.

What does it say about Owen Jones that he isn’t interested in scientific research?“What I find irritating about progressive politics is that it ignores and contradicts science, while at the same time pretending to be in favour of reason. The entire worldview is based on the tabula rasa idea of human nature which is contradicted by science. The blank slate makes the progressive goal of equality of outcomes possible; indeed, if equality is not achieved there can only be nefarious forces at work and ‘more work to be done’.” – from ed west. see also Fancy a job in academia or the media? Best brush up on the new political correctness“[Political correctness is] a faith, and it does not matter how daft the belief systems of a faith appear to a rational mind; if its critics sound backwards and out of touch and rural – literally ‘pagan’ – it will succeed.”

Both liberals and conservatives have anti-science biases, study finds“New research suggests that liberals, as well as conservatives, can be biased against science that doesn’t align with their political views.” — see also Nuclear Power and the Anti-Science Ideology of the “Progressive” Left from helian.

Why science is so hard to believe“Science appeals to our rational brain, but our beliefs are motivated largely by emotion, and the biggest motivation is remaining tight with our peers. ‘We’re all in high school. We’ve never left high school,’ says Marcia McNutt. ‘People still have a need to fit in, and that need to fit in is so strong that local values and local opinions are always trumping science. And they will continue to trump science, especially when there is no clear downside to ignoring science.'”

John Derbyshire On Culturalists vs. Biologians; Or, Where Is The American Harald Eia?

Have Mormons been bred for gullibility? – from agnostic.

Islam Is Not a Religion of the Book“By this, I mean that as a whole humans are prone to accepting the primary causal role of reflective cognition, of beliefs avowed and rationales offered. We are confident in our conscious self control, despite a robust body of cognitive psychology which implies that much of our cognition is not under the control or constraint of rational faculties. This problem is particularly extreme among intellectuals, the very class which also attempts to understand human phenomena. Through the simple process of introspection and extrapolation intellectuals tend to reduce human action to the outcome of ratiocination, inference from eternal axioms. This is wholly inadequate to a phenomenon as complex as religion.” – from razib.

Your DNA is everywhere. Can the police analyze it?“Supreme Court weighing if we must live in sealed bubbles to maintain DNA privacy.”

FDA panel could soon approve 23andMe home genetics test

Linguists link English, Hindi to single ancestor language spoken 6,500 years ago – h/t steve stewart williams!

Old India’s Village of Warriors Becomes Birthplace of Bouncers“Look closely and it becomes clear that the bouncers are all of a single physical type, their chests and biceps built like the front bumper of a sport utility vehicle. If they look like cousins, it is because they are. A startling number of them share a family name, Tanwar, and when the nightclubs close many will return to the same nearby village, a place where women walk down dusty lanes with their faces obscured by a cloth, balancing stacks of dried cow dung on their heads, much as their ancestors did three centuries ago…. The musclemen from the village of Fatehpur Beri are the descendants of the original inhabitants of the city, a genetic line that fortified itself over the course of centuries as they defended their village against waves of invaders on their way to the seat of empire. The sons and grandsons of cow and goat herders, they were born in an outpost surrounded on all sides by croplands. As Fatehpur Beri was swallowed by the expanding city, its spartan strongmen continued to train in the traditional way, stripping down to loincloths and wrestling in a circle of mud. But they were forced to look for a new line of work. ‘There is an element of the warrior in the Tanwars,’ said Ankur Tanwar, who opened the village’s first gym about a decade ago. ‘We fought with the Muslim invaders. We fought with the Britishers.'”

Ancient Egyptians had state-supported health care – at least some of them did.

bonus: Man’s best friend…unless you’re lying: How dogs can sense whether a person is trustworthy – h/t ninja economics! also: When you’re happy and you show it, dogs know it.

bonus bonus: The Cold May Have Cost Penguins Most of Their Taste Buds“Recent genetic analysis shows that penguins can’t taste sweet or bitter, and scientists think sub-zero temps may be to blame.”

bonus bonus bonus: Limpet teeth set new strength record

bonus bonus bonus bonus: Study Finds Jack Shit – h/t jayman!

bonus bonus bonus bonus bonus: Lost Sherlock Holmes story discovered

bonus bonus bonus bonus bonus bonus: a poem. (^_^)

bonus bonus bonus bonus bonus bonus bonus: #TheTitleOfMySexTape (~_^)

(note: comments do not require an email. limpet tooth.)


linkfest – 12/01/14

look! another linkfest! (^_^)

Our Cats, Ourselves“Which brings us to the genome of one critical tame animal: ourselves, humans. The Nobel Prize-winning zoologist Konrad Z. Lorenz once suggested that humans were subject to the same dynamics of domestication. Our brain and body sizes peaked during the end of the last ice age, and declined with the spread of agriculture…. Our cultural flexibility and creativity since the end of the ice age have not freed humans from evolutionary forces, but have opened up novel and startling paths. Thinking of domestication as an evolutionary process that occurs through ‘artificial’ selection creates a false dichotomy of nurture and nature that plays into a conceit of human exceptionalism. In fact, the idea that we are apart from nature, that it is ours to tame and exploit, is an outmoded approach. A more useful interpretation is that over the past 10,000 years, humans fashioned their own ecosystem. We were part of a natural process that altered the landscape…. The same forces that reshaped the genomes of our domesticates also reshaped ours.” – from razib. in the new york times! (^_^)

Ancient Easter Islanders Interbred With Native Americans“According to the recent study conducted by geneticists, the ancient inhabitants of Easter Island met and interbred with Native Americans long before Westerners arrived…. The recent genetic study is published on Thursday in the Current Biology journal. According to the study, these ancient people had significant contact with Native Americans hundreds of years ago, before the westerners reached the Island in 1722…. The finding of the study suggests that the intermixing occurred 19 to 23 generations ago. The researchers said that the Polynesian people (Rapa Nui’s) are not believed to have started mixing with Europeans until much later, the 19th century. Malaspinas said the genetic ancestry of today’s Rapa Nui people is roughly 75% Polynesian, 15% European and 10% Native American.”

Barley fuelled farmers’ spread onto Tibetan plateau“Cold-tolerant crop enabled high-altitude agriculture some 3,600 years ago”

Faster than Fisher“[M]igration and conquest, must explain the wide distribution of many geographically widespread selective sweeps and partial sweeps. They were adaptive, all right, but expanded much faster than possible from purely local diffusion.” – from greg cochran.

The Germ of Laziness – also from greg cochran.

Putting IBD to Bed – from razib.

The Red Queen Model of Recombination Hotspots Evolution in the Light of Archaic and Modern Human Genomes – h/t mwpennell! who tweeted: “Recombination hotspots in humans appear to be young…evidence for Red Queen theory for evolution of recombination?”

Inclusive fitness and sexual conflict: How population structure can modulate the battle of the sexes – h/t rebecca sear!

Do Chinese people get bored less easily?“Advanced farming — intensive land use, task specialization, monoculture — has profoundly shaped East Asian societies, particularly China. This is particularly so for rice farming. Because the paddies need standing water, rice farmers must work collectively to build, dredge, and drain elaborate irrigation networks. Wheat farming, by comparison, requires no irrigation and only half as much work. Advanced farming seems to have favored a special package of predispositions and inclinations, including greater acceptance of monotony. This has been shown in two recent studies.” – from peter frost.

Culture and state boredom: A comparison between European Canadians and Chinese“European Canadians (vs. Chinese) are more likely to experience state boredom.” – h/t erwin schmidt!

Gender differences in preferences, choices, and outcomes: SMPY longitudinal study“The figures show significant gender differences in life and career preferences, which affect choices and outcomes *even after ability is controlled for*…. According to the results, SMPY men are more concerned with money, prestige, success, creating or inventing something with impact, etc. SMPY women prefer time and work flexibility, want to give back to the community, and are less comfortable advocating unpopular ideas. Some of these asymmetries are at the 0.5 SD level or greater.” – from steve hsu.

Are liberals and conservatives differently wired? – also from peter frost.

Detecting ‘polygenes’ using signals of polygenic selection. Tools for increasing the power of GWAS – from davide piffer who tweeted: “Watson and Venter’s genomes have higher frequency of intelligence polygenenes.”

Intelligence lost at 1.23 IQ points per decade“Michael Woodley of Menie spends much of his time tending his ancestral estate, pacing the linen-fold panelled rooms of the ancient house, warming his hands at the towering stone fireplace and meditating on the collapse of the aristocracy, the paucity of contemporary innovation and the lamentable and persistent downward drift of the national intellect. Now he sends me a barefoot runner with his latest manuscript, which I have read as the autumn mists creep across the Nadder valley, before penning this reply for the poor urchin to carry back to his master. Young Woodley avers that, not only are we going to hell in a handcart, but we are doing so at a pace which he can predict with some accuracy (1.23 IQ points per decade), composed as it is of two dysgenic effects: the dull have been reproducing with greater fecundity than the bright (.39), and increasing paternal age has increased the rate of deleterious mutations (.84).” – from dr. james thompson.

Gypsy intelligence – also from dr. james thompson.

Lower Body Symmetry and Running Performance in Elite Jamaican Track and Field Athletes – h/t keith laws! who tweeted: “More symmetrical knees & ankles in Elite Jamaican track and field athletes…Of course…”

Great Ape Origins of Personality Maturation and Sex Differences: A Study of Orangutans and Chimpanzees

The Case Against Early Cancer Detection“[C]ancer screening may harm more people than it helps.” – h/t jason collins!

In the U.S., Few Heavy Drinkers Are Actually Alcoholics“About 90 percent of people who drink excessively — more than eight drinks a week for women, 15 for men — are not alcohol dependent.” – h/t ray sawhill!

Genes tell new story: Alcohol in moderation only benefits 15% of population“An alcoholic beverage a day, especially wine, is widely believed to help keep heart disease risk low, but new research from the University of Gothenburg shows that only about 15% of the human population — those with a specific the form of the cholesteryl ester transfer protein (CETP) gene — actually gain this benefit from moderate alcohol consumption.”

The Real Roots of Midlife Crisis“What a growing body of research reveals about the biology of human happiness — and how to navigate the (temporary) slump in middle age.”

Despite its problems, the United States of America is still the best. Thing. Ever.“Other aspects of America’s story, though, seem less important now that the quest for racial equality has become almost a religious mission; this week I finally got around to watching the HBO series John Adams, which begins with the Massachusetts lawyer defending Captain Thomas Preston, the officer blamed for the Boston massacre. The mob wanted to avenge the deaths but, this being a colony where people passionately believed in their ancestral English liberties, ‘due process’ was followed – a term that dates back to the Parliament of Edward III but was obviously influenced by Clause 39 of the Magna Carta. Due process is what was followed in the Ferguson case, but maybe that’s just a boring old racist Anglo-Saxon idea that we can forget about now (grand juries are literally Anglo-Saxon, dating back to the reign of Ethelred II, or possibly the vibrant culturally-enriching Viking maniac King Canute).” – from ed west.

Children are not science projects“What do we tell to prospective adoptive parents? The first answer, and the only answer that ultimately counts, is that they are doing the Lord’s work. They have the opportunity to provide love and nurturing to a child who needs it. There are few better things that human beings can do with their time. The second answer is that they, like biological parents, are not miracle-workers. They will be unable to mold the child. Sometimes their adopted child will experience problems that are not the adoptive parents’ fault; sometimes they will reveal gifts of talent and character that are equally not to the adoptive parents’ credit. What is to the credit of good parents, adoptive and biological alike, is enfolding the child in love.” – from charles murray…who’s really just a big softie after all. (^_^) — see also: Adopt a child, but discard an illusion from dr. james thompson.

In Northern Ireland, a Wave of Immigrants Is Met With Fists – which came (or *should’ve* come) as a surprise to absolutely no one….

When exactly did the Industrial Revolution start?

Europe’s Bronze Age Collapse Not Caused by Climate Change

How Thanksgiving, the ‘Yankee Abolitionist Holiday,’ Won Over the South

Your Inner Feather“About 300 million years ago, our ancestors began to lay hard-shelled eggs. Those early animals would give rise to mammals, reptiles, and birds (collectively known as amniotes, named for the amniotic egg). Edwards and his colleagues found that the first amniotes already had the *entire* complement of feather patterning genes. That means you, as an amniote, have them too.” – cool!

Viruses as a Cure

Stop eating cats and dogs say animal rights campaigners in Switzerland“Cat appears on traditional Christmas menus in some areas of Switzerland.” – wait. what?!

bonus: Snakes are ‘righties’ — with their penis, that is

bonus bonus: Snakes Leave Identity Within Their Fang Marks“Getting a DNA swab from the fang marks of a snake bite can accurately identify the type of snake, a team working in Nepal has found.”

bonus bonus bonus: Monterey Bay researchers capture rare deep-sea anglerfish on video for first time – whoa!

bonus bonus bonus bonus: Ants Regularly Pack Up and Dig New Nests, and Nobody Knows Why

bonus bonus bonus bonus bonus: Red Baron’s WWI German Fokker triplane rebuilt by flying enthusiast – oooo! pretty. (^_^)

(note: comments do not require an email. a face only a mother could love. maybe.)

linkfest: 05/27/14

Quick Questions for Peter and Rosemary Grant“There is widespread misunderstanding about evolution; that it occurs extremely slowly and therefore cannot be studied in a person’s lifetime. This was the view of Charles Darwin. Many biologists and others now know that this is not correct…. The idea that animals as large as birds might evolve before our eyes is not so well known, yet our study in the entirely natural world of Daphne Major island has revealed this does in fact happen when there is a change in the environment, and it takes place over a period as short as a year, and repeatedly.” – h/t billare!

Is DNA Multilingual?“The genetic code has traditionally been viewed as a universal set of instructions, exquisitely tuned to maintain robust stability and allow evolution-sustaining mutations. But the pervasive occurrence of recoded stop codons, and the backchannel crosstalk between microbes and viruses, paints a more intricate picture of multilingual genetic instructions.”

Jelly genome mystery“The uniqueness of this ctenophore’s nervous system leads Moroz and his team to argue that it must have evolved independently, after the ctenophore lineage branched off from other animals some 500 million years ago.”

Genomic divergence in a ring species complex“Ring species provide particularly clear demonstrations of how one species can gradually evolve into two, but are rare in nature…. Here we use genome-wide analyses to show that, although spatial patterns of genetic variation are currently mostly as expected of a ring species, historical breaks in gene flow have existed at more than one location around the ring, and the two Siberian forms have occasionally interbred.” – h/t razib!

Natural selection and infectious disease in human populations“The ancient biological ‘arms race’ between microbial pathogens and humans has shaped genetic variation in modern populations, and this has important implications for the growing field of medical genomics. As humans migrated throughout the world, populations encountered distinct pathogens, and natural selection increased the prevalence of alleles that are advantageous in the new ecosystems in both host and pathogens. This ancient history now influences human infectious disease susceptibility and microbiome homeostasis, and contributes to common diseases that show geographical disparities, such as autoimmune and metabolic disorders.”

High genetic differentiation between populations often driven by classic selective sweeps“‘We demonstrate that while sites of low differentiation represent sampling effects rather than balancing selection, sites showing extremely high population differentiation are enriched for positive selection events and that one half may be the result of classic selective sweeps. Among these, we rediscover known examples, where we actually identify the established functional SNP, and discover novel examples including the genes ABCA12, CALD1 and ZNF804, which we speculate may be linked to adaptations in skin, calcium metabolism and defense, respectively. Conclusions: We have identified known and many novel candidate regions for geographically restricted positive selection, and suggest several directions for further research.'” – @dienekes’.

Mendelian-Mutationism: The Forgotten Evolutionary Synthesis – h/t neuroskeptic! who tweeted: “Did geneticists ‘crack’ the secret of evolution much earlier than believed?”

this one’s for linton!: Why Marrying Your Cousin May Pay Off“In line with previous findings, the researchers found that among non-foraging societies, a couple’s relatedness was linked with having more surviving children. But among foraging societies, the opposite was true: More-closely related spouses had fewer surviving children. Furthermore, the more family intermarriage in a society, the greater the benefit of intermarrying on the number of children couples had. In other words, in societies in which people frequently married their relatives, intermarrying showed a stronger link to having more children.”

The Closest of Strangers“[I]dentical twins who are aunts and uncles invest more in caring for the children of their twins (their ‘genetic’ sons and daughters) than do fraternal twins.”

Why Do Honor Killings Defy the First Law of Homicide? And Will Smaller Families Lead to Fewer Of Them? – h/t tom farsides! – previously: inclusive inclusive fitness.

Genetic and educational assortative mating among US adults“We find that spouses are more genetically similar than two individuals chosen at random but this similarity is at most one-third the magnitude of educational similarity.”

Irish fair skin can be traced to India and the Middle East“A major new US study at Penn State University has found that Europeans’ light skin stems from a gene mutation from a single person who lived 10,000 years ago…. Keith Cheng from Penn State College of Medicine reported that one amino acid difference in the gene SLC24A5 is a key contributor to the skin color difference between Europeans and West Africans…. ‘The mutation in SLC24A5 changes just one building block in the protein, and contributes about a third of the visually striking differences in skin tone between peoples of African and European ancestry, he said…. The mutation, called A111T, is found in virtually everyone of European ancestry. A111T is also found in populations in the Middle East and Indian subcontinent, but not in high numbers in Africans. All individuals from the Middle East, North Africa, East Africa and South India who carry the A111T mutation share traces of the ancestral genetic code. According to the researchers, this indicates that all existing instances of this mutation originate from the same person.” – h/t 23andMe!

The puzzle of European hair, eye, and skin color“The physical appearance of Europeans seems to result from a selection pressure that acted primarily on women and only secondarily on men. This is especially true for highly visible traits on or near the face—the focus of visual attention.” – from peter frost.

The Dark Triad of Personality – special issue of Personality and Individual Differences. – h/t claire lehmann!

Heritability of brain volume change and its relation to intelligence“Human brain volumes change throughout life, are highly heritable, and have been associated with general cognitive functioning…. Results show that changes in volumes of total brain (mean=-6.4ml; -0.5% loss), cerebellum (1.4ml, 1.0% increase), cerebral white matter (4.4ml, 0.9% increase), lateral ventricles (0.6ml; 4.8% increase) and in surface area (-19.7cm2, -1.1% contraction) are heritable (h2=43%; 52%; 29%; 31%; and 33%, respectively). An association between IQ (available for 91 participants) and brain volume change was observed, which was attributed to genes involved in both the variation in change in brain volume and in intelligence. Thus, dynamic changes in brain structure are heritable and may have cognitive significance in adulthood.”

Cognitive abilities amongst the Sámi population“Lapps have an IQ around 100.8 are tilted towards visuospatial ability and away from verbal ability.” – from elijah armstrong, michael woodley the younger, and richard lynn. edit: original paper here on elijah’s blog! (^_^)

The Flynn Effect in a Nutshell – from elijah.

Does brain structure determine your political views?“‘People like to believe that their own political beliefs are rational, that they’re a sensible response to the world around them, so when we come along and say, “Maybe there are these predispositions, influential but perhaps not fully in your conscious awareness,” that’s not the way we like to view our own political beliefs.'” – h/t mr. robert ford!

Sex-Related Neuroanatomical Basis of Emotion Regulation Ability“Behavioral research has demonstrated that males have a higher capability of regulating their own and others’ emotions than females; however, little is known about the sex-specific brain mechanisms involved in emotion regulation ability…. we found the sex differences in the neuroanatomical basis of emotion regulation ability. Males showed a stronger positive relation between emotion regulation ability and regional gray matter volume (rGMV) in the right dorsolateral prefrontal cortex. In contrast, females demonstrated a stronger positive relation between emotion regulation ability and rGMV in an anatomical cluster that extends from the left brainstem to the left hippocampus, the left amygdala and the insular cortex.”

More Maps of the American Nations – from jayman.

Privilege and Morality“Our species isn’t good at nuance. The ‘privilege’ debate will and must take place in a morally charged context. It is not possible to sanitize the discussion by scrubbing it free of moral emotions. That is one of the many reasons why it is so important to understand what morality is and why it exists. It does not exist as a transcendental entity that happened to pop into existence with the big bang, nor does it exist because the Big Man upstairs wants it that way. It exists because it evolved.” – from helian.

Economic Growth & Human Biodiversity“Economic growth in lower-IQ countries does not invalidate either the reality of IQ differences between countries or the persistence of those disparities.” – from pseudoerasmus.

Good Fences: The Importance of Setting Boundaries for Peaceful Coexistence“Switzerland is recognized as a country of peace, stability and prosperity. This is surprising because of its linguistic and religious diversity that in other parts of the world lead to conflict and violence. Here we analyze how peaceful stability is maintained. Our analysis shows that peace does not depend on integrated coexistence, but rather on well defined topographical and political boundaries separating groups, allowing for partial autonomy within a single country. In Switzerland, mountains and lakes are an important part of the boundaries between sharply defined linguistic areas. Political canton and circle (sub-canton) boundaries often separate religious groups. Where such boundaries do not appear to be sufficient, we find that specific aspects of the population distribution guarantee either sufficient separation or sufficient mixing to inhibit intergroup violence according to the quantitative theory of conflict. In exactly one region, a porous mountain range does not adequately separate linguistic groups and that region has experienced significant violent conflict, leading to the recent creation of the canton of Jura.”

Was Territoriality Important in the Pleistocene? A Commentary on Johnson and Toft – @peter turchin’s.

Southern Europe is suspicious: the evolution of trust in the EU – ess and wvs results.

Trust and In-Group Favoritism in a Culture of Crime [pdf] – h/t ben southwood! who tweeted: “Areas in Palermo with high Mafia involvement have lower generalised trust but higher in-group favouritism.”

In dogs’ play, researchers see honesty and deceit, perhaps something like morality – woof!

What is Phonemic Diversity? — And Does It Prove the Out-of-Africa Theory? – h/t james winters!

How a Protestant spin machine hid the truth about the English Reformation“It seems that in 1533, the year of Henry’s break from Rome, traditional Catholicism was the religion of the vast majority of the country. And in most places it was absolutely thriving. It had developed a particularly English flavour, with a focus on the involvement of ordinary people in parish churches, village greens, plays, and pageants – much of which seemed to involve a good deal of community parties, dancing, and drinking. It is true that English religion in the early 1500s was not especially studious or erudite. The people did not spend hours a day in biblical studies, contemplation, and moralising in the manner of the more intense European reformers. But England had a nationally cohesive spirituality that was alive and exuberant, with a distinctly community feel…. The conclusion of this modern grassroots scholarship is that bulldozing the Catholic Church off the face of medieval England was not a ‘bottom up’ revolution in which Henry merely acquiesced to his people’s wishes by throwing off a widely hated foreign domination. To the contrary, it looks increasingly like Henry and his circle imposed the Reformation ‘top down’, unleashing 100 years of deep anger and alienation that was only overcome by sustained politicking and ruthless force.” – h/t william briggs!

bonus: “No Oxygen? No Problem!” Says Squid That Can Shut Down Its Metabolism – h/t kyle hill!

bonus bonus: A Theory on How Flightless Birds Spread Across the World: They Flew There

bonus bonus bonus: Chicken project gets off the ground“Effort aims to unravel the history of bird’s domestication.” – cluck!

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linkfest – 02/17/14

making up for a few lost weekends linkfests…

Tracing Ancestry, Researchers Produce a Genetic Atlas of Human Mixing Events“Researchers have found genetic evidence for hundreds of examples of the large-scale mixing of human populations in the past 4,000 years.” – see also: A Genetic Atlas of Human Admixture History“We used this to produce an atlas of worldwide human admixture history, constructed by using genetic data alone and encompassing over 100 events occurring over the past 4000 years. We identified events whose dates and participants suggest they describe genetic impacts of the Mongol empire, Arab slave trade, Bantu expansion, first millennium CE migrations in Eastern Europe, and European colonialism, as well as unrecorded events, revealing admixture to be an almost universal force shaping human populations.” – see also: A genetic atlas of human admixture history. – see also from dienekes: Human admixture common in human history (Hellenthal et al. 2014).

Earliest footprints outside Africa discovered in Norfolk“Scientists have discovered the earliest evidence of human footprints outside of Africa, on the Norfolk Coast in the East of England. The footprints are more than 800,000 years old and were found on the shores of Happisburgh.”aaaand then they got washed away in the storms. (>_<)

Modern human genomes reveal our inner Neanderthal“Cross-breeding boosted Homo sapiens’ ability to cope with cool climates, but the hybrids may have had trouble breeding.” – see also: Neanderthal-human sex bred light skins and infertility. and see also: Adaptive Neanderthal admixture – from greg cochran.

Science discovers new ignorance about the past – good stuff from matt ridley.

Genetic origins of high-altitude adaptations in Tibetans“Genetic adaptations for life at high elevations found in residents of the Tibetan plateau likely originated around 30,000 years ago in peoples related to contemporary Sherpa. These genes were passed on to more recent migrants from lower elevations via population mixing, and then amplified by natural selection in the modern Tibetan gene pool, according to a new study.” – see also: Admixture facilitates genetic adaptations to high altitude in Tibet – see also: A novel mechanism for getting high – from greg cochran. – see also: Tibetan mastiffs equally adapted to high altitudes of Tibet.

Immediate replacement of fishing with dairying by the earliest farmers of the northeast Atlantic archipelagos [i.e. british isles] – “These new findings…unequivocally confirm rejection of marine resources by early farmers coinciding with the adoption of intensive dairy farming. This pattern of Neolithization contrasts markedly to that occurring contemporaneously in the Baltic, suggesting that geographically distinct ecological and cultural influences dictated the evolution of subsistence practices at this critical phase of European prehistory.”

The booms and busts of Neolithic Europe (and their potential impact on our DNA)“most of the interactions between the genetically Near Eastern-like Neolithic farmers and indigenous European hunter-gatherers, including mixing, in all likelihood took place on the peripheries of the farming societies. If so, then perhaps every time there was a bust, it was the relatively more admixed, or even more hunter-gatherer-like, farmer groups from the peripheries that took advantage of the situation and moved in to grab some land in the depopulated regions? In other words, this might have been the process which led to the well-documented reemergence of hunter-gatherer-derived ancestry in the heart of Europe after the early Neolithic.” – @eurogenes.

First Ancient North American Genome Sequenced“Analysis of 12,600-year-old DNA refutes the idea that Native Americans originated in Western Europe.” – see also: The genome of a Late Pleistocene human from a Clovis burial site in western Montana

The Fading of the Most Basal of Basal“[T]he western and eastern Pygmy populations of the Congo rainforest seem to have diverged tens of thousands of years ago, tens of thousands of years after their divergence from the ancestors of their agriculturalist neighbors.” – from razib.

Slow times in the New World – from greg cochran.

Genetic ancestry is associated with colorectal adenomas and adenocarcinomas in Latino populations“[I]ncreased African ancestry (or variants linked to it) contributes to the increased susceptibility of colorectal cancer in admixed Latin American population.” – h/t razib!

Black Death Left a Mark on Human Genome“Genetically, the Rroma are still quite similar to the northwestern Indians, even though they have lived side by side with the Romanians for a millennium, the team found. But there were 20 genes in the Rroma and the Romanians that had changes that were not seen in the Indians’ versions of those genes, Netea and his colleagues report online today in the Proceedings of the National Academy of Sciences. These genes ‘were positively selected for in the Romanians and in the gypsies but not in the Indians,’ Netea explains. ‘It’s a very strong signal.'”

HBD is Life and Death – from jayman.

Chemists Seek Possible Precursor to RNA – h/t billare! who tweeted: “Were there self-assembling replicants—proto-RNAs—before RNA world? Researchers find some candidates.”

The Unique Merger That Made You (and Ewe, and Yew)“All sophisticated life on the planet Earth may owe its existence to one freakish event.” – mitochondria, eukaryotes, yada, yada, yada.

Study demonstrates evolutionary ‘fitness’ not the most important determinant of success“By modelling populations over long timescales, the study showed that the ‘fitness’ of their traits was not the most important determinant of success. Instead, the most genetically available mutations dominated the changes in traits. The researchers found that the ‘fittest’ simply did not have time to be found, or to fix in the population over evolutionary timescales. The findings suggest that life on Earth today may not have come about by ‘survival of the fittest’, but rather by the ‘arrival of the frequent’.”

Burakumin, Paekchong, and Cagots“Human evolution is a logarithmic curve where most of the interesting changes have happened since the advent of farming and complex societies. *Homo sapiens* was not a culmination but rather a beginning…of gene-culture co-evolution. There are many ways to study this co-evolution, but one way is to look at the different evolutionary trajectories followed by castes and their host populations.” – from peter frost.

Of Genetic Determinists and Unicorns – from helian.

Geographic variation of human gut microbes tied to obesity“[P]eople living in northern latitudes have a greater proportion of the Firmicutes associated with obesity than do people living farther south, and a smaller proportion of Bacteroidetes. The implications are unclear, though microbes may evolve with people to better extract energy from food in colder climates.” – h/t claire lehmann! – also: I had the bacteria in my gut analysed. And this may be the future of medicine.

A Dog Can’t Teach a Dog New Tricks (But It Can Teach a Wolf) – *cough*domestication*cough* – h/t neuroskeptic!

Revolutionary new view on heritability in plants: Complex heritable traits not only determined by changes in DNA sequence“Complex heritable traits are not only determined by changes in the DNA sequence. Scientists have now shown that epigenetic marks can affect traits such as flowering time and architecture in plants. Furthermore, these marks are passed on for many generations in a stable manner.” – in PLANTS! (are you a plant?)

Single nucleotide polymorphism in the neuroplastin locus associates with cortical thickness and intellectual ability in adolescents – h/t stuart ritchie! – also: Scientists identify gene linking brain structure to intelligence.

The many-headed Hydra of alternate intelligences – from dr. james thompson.

Quick Post: L&V’s National IQs predict GMAT scores across 173 nations“We have shown that measures of national cognitive ability predict both GMAT scores and English proficiency scores independent of rates of English usage. GMAT and English proficiency scores seem to be indexes of National (g) by way of National IQ and National ACH.” – @human varieties.

Meritocracy doesn’t work. It’s in the Left’s interest to recognise this.“The Son Also Rises, a study of social mobility by Gregory Clark, will surprise and also alarm some people. He notes, by using surname patterns, that mobility is minimal in all societies where the data is available. Even, for example, in the Nordic paradise of Sweden. He says: ‘In all societies, what seems to matter is just who your parents are. At the extreme, we see in modern Sweden an extensive system of public education and social support. Yet underlying mobility rates are no higher in modern Sweden than in pre-industrial Sweden or medieval England.’ He also notes that even in revolutionary societies, such as in Communist China, people with aristocratic surnames also turn up at the top, showing that once again Darwin trumps Marx.” – from ed west. – see also: Everyone likes the idea of equal opportunity. This economist thinks it’s a fantasy.

The Ideological-Conflict Hypothesis: Intolerance Among Both Liberals and Conservatives“[L]iberals and conservatives express similar levels of intolerance toward ideologically dissimilar and threatening groups.”

Sadism: A New Addition to the Dark Triad? – from staffan.

You Are Not A Special Snowflake – from sisyphean the mad contrarian.

Males and females differ in specific brain structures“Reviewing over 20 years of neuroscience research into sex differences in brain structure, researchers have conducted the first meta-analysis of the evidence. The team performed a quantitative review of the brain imaging literature testing overall sex differences in total and regional brain volumes. They found that males on average have larger total brain volumes than women (by 8 to 13 percent). Looking more closely, the researchers found differences in volume between the sexes were located in several regions. These included parts of the limbic system, and the language system.”

Major sex differences in brain gene expression – from mr. mangan, esq. – also: How Can This Be? – from malcolm pollack.

How much do sex differences matter in sports?“Thanks in large part to testosterone, men are generally heavier and taller than women. They have longer limbs relative to their height, bigger hearts and lungs, less fat, denser bones, more oxygen-carrying red blood cells, heavier skeletons that support more muscle — 80 percent more in the upper body, on average, which is about the difference between male and female gorillas — and narrower hips that make for more efficient running and decrease the chance of injury. But since these differences generally don’t appear until puberty, boys’ and girls’ records in track tend to be identical before age 10. There’s scant biological reason to separate young boys and girls in competitions.” – from david epstein.

How the gender divide reaches into our nightmares“A study has found women are more likely to dream of interpersonal disputes, while men tend to face war, calamities and insect swarms alone.”

Be My Valentines: Is Monogamy Natural to Us?“It turns out that we aren’t monogamous or polygamous by nature. As everyone from poets to divorce attorneys can attest, we are by nature a profoundly confused species—somewhere in between.” – h/t robert ford!

Male infanticide leads to social monogamy in primates“The origin of social monogamy in primates is best explained by long lactation periods caused by altriciality, making primate infants particularly vulnerable to infanticidal males. We show that biparental care shortens relative lactation length, thereby reducing infanticide risk and increasing reproductive rates. These phylogenetic analyses support a key role for infanticide in the social evolution of primates, and potentially, humans.” – h/t heartiste!

23andMe Couples Correlated“For Valentine’s Day, we analyzed data from 15,298 real-world couples who had children together and found that people paired with others who were more like themselves than they were different.”

How Women Gang Up On Each Other To Get What They Want – from claire lehmann.

Morality and evolution – from mr. mangan, esq.

Cultural Marxism, gay-style – hints of left-wing authoritarism? i think so. from the awesome epigone.

Panthropology reveals 4,300 year old chimp site

Ethnic diversity’s ‘inconvenient truths’“[W]hen the Vancouver Foundation recently conducted a massive survey of Metro Vancouver residents, researchers discovered most people in this West Coast city feel unusually high levels of loneliness and lack of friends…. The Vancouver Foundation survey of 3,800 diverse Metro residents confirmed Putnam’s results. It found one in four Metro residents feels alone more often than they would like, one-third consider Vancouver a difficult place to make friends, most don’t socialize with their neighbours, half don’t volunteer and most feel that, while diversity is generally a good thing, they prefer to be with members of their own ethnic group.” – h/t mike anissimov!

Rainforests in Far East shaped by humans for the last 11,000 years“New research shows that the tropical forests of South East Asia have been shaped by humans for the last 11,000 years. The rain forests of Borneo, Sumatra, Java, Thailand and Vietnam were previously thought to have been largely unaffected by humans, but the latest research suggests otherwise.”

The Case of Moulay Ismael – Fact or Fancy?“The results indicate that Moulay Ismael could have achieved this high [888 children!] reproductive success.” – btw, that’s moulay ismael the bloodthirsty to you!

How HBD Will Make you a Better Person“[F]orbidden knowledge does not result in genocide. The problem with this view is that genocide has been the norm throughout human history — that is, until very recently. On a historical timeline, our recent scientific knowledge of racial differences actually negatively correlates with the historic trend of genocide.” – @occam’s razor.

Robots and HBD denialism“The coming robot revolution will make the labor of people below a certain IQ totally worthless. This is an event never before experienced by humanity.” – from the lion of the blogosphere.

The outgrowth of Muller’s eugenics program“[T]he eugenics program described by Muller, as such, has become a reality.” – h/t jayman and billare!

Being lazy could be genetic say scientists – study done on (lazy, good for nuthin’!) mice.

Male sexual orientation influenced by genes, study showsGenes examined in study are not sufficient or necessary to make men gay but do play some role in sexuality, say US researchers.”

Church Making Strides Preserving African Family Histories“Genealogy experts are experiencing a race against time in Sub-Saharan Africa; an area that spans 36 countries. There is an urgency to collect oral interviews of African genealogy because family historians are aging and some are dying before those histories can be recorded.” – h/t t.greer!

Plagiarism attitudes common across cultures – in children – h/t naturalismo!

Richard III DNA mapping: historic first lets experts look into eyes of Plantagenet king“Scientists will be able to check whether portraits of a dark-haired brooding monarch are accurate.”

Norse Rune code cracked“A scholar of the University of Oslo has cracked one of the rune codes used by the Vikings, revealing they were sending each other messages such as ‘Kiss me’.” -?!-

Midiclorianos: determinismo biológico en Star wars – REALLY important stuff from eduardo zugasti. (^_^)

After 400 years, mathematicians find a new class of solid shapes“Nearly 400 years after the last class was described, researchers claim that they may have now invented a new, fourth class, which they call Goldberg polyhedra.” – h/t jason moore!

bonus: Nigeria: Restaurant Served Roasted Human Heads – yup.

bonus bonus: Huge chimpanzee population thriving in remote Congo forest“Scientists believe the group is one of the last chimp ‘mega-cultures’, sharing a unique set of customs and behaviour.”

bonus bonus bonus: Camels Had No Business in Genesis“Radiocarbon dating was used to pinpoint the earliest known domesticated camels in Israel to the 10th century B.C.— decades after the kingdom of David, according to the Bible.”

bonus bonus bonus bonus: Cat parasite found in Arctic Beluga“The cat parasite *Toxoplasma gondii*, which can cause blindness in people, has been identified in Beluga in the western Arctic.” – h/t carl zimmer!

bonus bonus bonus bonus bonus: The Rise of the Crazy Ants“Ants equipped with venom antidote invade southeastern U.S.” – h/t hbd bibliography!

bonus bonus bonus bonus bonus bonus: This Tiny Animal Can Live an Estimated 1,400 Years

bonus bonus bonus bonus bonus bonus bonus: Conservative Acquaintance Annoyingly Not Racist – h/t niall gooch!

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linkfest – 09/10/11

Earliest Signs of Advanced Tools Found — also, john hawks on the find.

The Verge of Human – @the loom. there might be some fossilized skin from one of these fossils, too. cool!!

Modernity and the Lynn-Flynn Effect – from dennis mangan.

Human ancestors interbred with related species“Analysis suggests genetic mixing occurred in Africa around 35,000 years ago…. Hammer says this disproves the conventional view that we are descended from a single population that arose in Africa and replaced all other Homo species without interbreeding. ‘We need to modify the standard model of human origins,’ he says.”

Study links baby’s behavior and adult brain function“A new study that tracked children from before they were teething until they were graduating high school suggests that a baby boy’s temperament may predict his brain activity nearly two decades later.”

Freedom to Riot: On the Evolution of Collective Violence“Collective violence, extending from riots to warfare, presents a challenge to our ordinary understanding of free will. Actions that would rarely be taken by an individual on their own seem to be embraced when supported by a larger group.”

Scientists find they can control how people react to group pressure – baaaaaaah.

Why Is Average IQ Higher in Some Places? – it’s not the whole story, but it’s likely part of it.

Couch Potatoes Explained? Missing Key Genes May Be Cause for Lack of Resolve to Exercise, Researchers Find

Blacks are more narcissistic – @the inductivist.

bonus: The “Yellow Snow” Test for Self-Recognition – watch out where the huskies go!

bonus bonus: The irrationality of politics

(note: comments do not require an email. baaaaaaah.)