‘Tree of life’ for 2.3 million species released – “A first draft of the ‘tree of life’ for the roughly 2.3 million named species of animals, plants, fungi and microbes — from platypuses to puffballs — has been released. A collaborative effort among eleven institutions, the tree depicts the relationships among living things as they diverged from one another over time, tracing back to the beginning of life on Earth more than 3.5 billion years ago. Tens of thousands of smaller trees have been published over the years for select branches of the tree of life — some containing upwards of 100,000 species — but this is the first time those results have been combined into a single tree that encompasses all of life.”
Taste Mutation Helps Monkeys Enjoy Human Food – nice example of recent and local evolution.
SNP hits on cognitive ability from 300k individuals – from steve hsu.
General Cognitive Ability Is Almost Perfectly Stable from Early Adulthood to Late Middle Age – “[I]ndividual differences in general intelligence that exist at age 18 are almost perfectly preserved to age 60, after which this stability starts to slowly break down.” – @ human varieties.
Genome-wide autozygosity is associated with lower general cognitive ability – “We found that increased levels of autozygosity predicted lower general cognitive ability, and estimate a drop of 0.6 s.d. among the offspring of first cousins (P=0.003–0.02 depending on the model). This effect came predominantly from long and rare autozygous tracts, which theory predicts as more likely to be deleterious than short and common tracts.” – discuss. (~_^)
Study Reports Rare Genetic Mutations Responsible for Almost Half of Autism Cases – “Quantitative study identifies 239 genes whose ‘vulnerability’ to devastating de novo mutation makes them priority research targets.”
Clannishness – the Series: Zigzag Lightning in the Brain – from jayman. see also: a few thoughts. from me! (^_^)
It’s official: The Maltese are the fattest in all of the European Union – “Despite Malta’s weighty problem, the Maltese have a less than average prevalence of premature mortality from cardiovascular diseases, cancer, diabetes and chronic respiratory disease.” – h/t staffan!
Support for linguistic macrofamilies from weighted sequence alignment – “This article reports findings regarding the automatic classification of Eurasian languages using techniques from computational biology (such as sequence alignment, phylogenetic inference, and bootstrapping). Main results are that there is solid support for the hypothetical linguistic macrofamilies Eurasiatic and Austro-Tai.”
Ancient hominid ears were tuned to high frequencies – “A. africanus and P. robustus could have heard high-frequency consonants associated with the letters t, k, f and s better than either chimps or present-day people do, the team found.”
Extreme Altruism – The Case of the Pathological Do-Gooder – from helian.
Personal values and intergroup outcomes of concern for group honor – h/t andrew sabisky! who tweeted: “group honour culture = more empathy, lower openness, more endorsement of violence towards Americans.”
Scope Insensitivity in Helping Decisions: Is It a Matter of Culture and Values? – h/t robin hanson! who tweeted: “Contrast to westerners, collectivist Bedouin NOT more willing to help one concrete victim than a group of victims.”
Indigenous Belief in a Just World: New Zealand Māori and other Ethnicities Compared – “Māori have more ‘leftist’ beliefs than non-Māori (i.e., nearly 60% of Māori blame an unfair society compared to 41% of non-Māori).”
An architecture for encoding sentence meaning in left mid-superior temporal cortex – h/t steve pinker! who tweeted: “The most important paper in cognitive neuroscience in many years: How does the brain represent who did what to whom?”
Does the Welfare State Destroy the Family? Evidence from OECD Member Countries – “[A]n expansion in the welfare state increases the fertility, marriage, and divorce rates with a quantitatively stronger effect on the marriage rate. We conclude that the welfare state supports family formation in the aggregate. Further, we find that the welfare state decouples marriage and fertility, and therefore, alters the organization of the average family.”
What is a standard deviation? A definition. – from pumpkin person.
Data analysis yields striking maps of human expansion in North American Holocene – “[A] group of paleoclimatologists and anthropologists analyzed data recorded in the Canadian Archaeological Radiocarbon Database (CARD), which aggregates 35,905 radiocarbon samples from archaeological sites across the North American continent, and was created by Dr. Richard Morlan of the Canadian Museum of History. By applying a kernel density estimation method to the data, the researchers produced the first maps of temporally distinct paleo-demographic trends that correspond well to existing evidence of human expansion across North America in the Holocene.”
bonus: Growing a penis at 12: the ‘Guevedoce’ boys of the Dominican Republic – (O.O) – h/t @don_arete!
and the tweet of the week! (~_^) :
(note: comments do not require an email. 5-alpha-reductase deficiency.)