Articles with the keyword: 
Natural selection does not explain cultural rates of change
sea-maid submitted, created time 6 months 4 weeks (www.pnas.org)
This abstract tell us that Rogers and Ehrlich find that canoe functional design features change more slowly than symbolic ones. And at last they attribute this to positive selection. 
Ban on first-cousin marriages "not necessary"
sea-maid submitted, created time 7 months 2 weeks (www.newscientist.com)
It found that infant mortality is only 1.2 per cent higher among the children of first cousins compared with children that have more distantly related parents.
Study finds troops shy away from mental health care
sea-maid submitted, created time 8 months 1 week (www.cnn.com)
A survey released Wednesday that U.S. military personnel fear that seeking help for mental health problems could harm their careers. One of people said a military culture that emphasizes toughness could hinder efforts to get troops to seek help.
Evolution of Counting Is No Simple Operation
Eric wu submitted, created time 11 months 3 weeks (sciencenow.sciencemag.org)
You may not realize it, but when you tell the grocer you'd like a half-dozen eggs for your family of six, you're using a primitive numbering system.
Now, a study of Pacific Island languages suggests that counting systems can evolve in reverse, becoming more object-specific.
This is a very interesting topic on evolution......
Culture Speeds Up Human Evolution
jane2007 submitted, created time 1 year 4 weeks (www.sciam.com)
Homo sapiens sapiens has spread across the globe and increased vastly in numbers over the past 50,000 years or so—from an estimated five million in 9000 B.C. to roughly 6.5 billion today. More people means more opportunity for mutations to creep into the basic human genome and new research confirms that in the past 10,000 years a host of changes to everything from digestion to bones has been taking place.
The article tell us the history of human evolution with the development of culture. In other word, human evolution affect by the nature and society culture.
Higher blood flow and circulating NO products offset high-altitude hypoxia among Tibetans
franklin submitted, created time 1 year 2 months (www.pnas.org)
The low barometric pressure at high altitude causes lower arterial oxygen content among Tibetan highlanders, who maintain normal levels of oxygen use as indicated by basal and maximal oxygen consumption levels that are consistent with sea level predictions.
Do frozen human ova remain viable? Different voices disagree.
Hecate submitted, created time 1 year 2 months (www.nature.com)
Scientists are debating whether the practice of freezing human ova should be considered experimental or whether it should be deemed standard. (This distinction, pedantic though it may seem, has some consequences for health insurance.) The debate covers not only the best method for freezing eggs (slow-freeze vs. fast, in layman's terms) but the circumstances under which it is appropriate to do so at all.
Many women choose to freeze their eggs because of illness. For example, some forms of radiation and chemotherapy can cause infertility
Warfare, climate and warning bells
Darkfrog submitted, created time 1 year 5 months (www.nature.com)
Scientists have linked periods of warfare in Chinese history to the climate: When food is scarce, people fight more. This might seem obvious, but the kicker is that the warlike periods start thirty to forty years AFTER the start of a cold snap.
Time enough to prepare countermeasures, perhaps?
NBOP? Nope! The preservation of plastics confounds curators, collectors.
Darkfrog submitted, created time 1 year 7 months (www.nature.com)
Museum curators and environmentalists have the opposite problem: Environmentalists can't get plastics to break down fast enough and museum curators can't make it stick around long enough. Many plastics -- think classic baby dolls -- are approaching the century mark, and though they may linger in landfills, they just don't have the longevity of ceramics, paintings and stone.
Now what might be cool would be if these two groups could get together and compare notes. Someone would pull something useful out of that discussion
Beer in particular: civilization and alcohol
Darkfrog submitted, created time 1 year 8 months (www.sciam.com)
Scientific American reexamines the idea of beer as a founding pillar of civilization. (For many, this will not be news.)
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