Παρασκευή, 2 Μαΐου 2014

ScienceDaily: Most Popular News

ScienceDaily: Most Popular News


Neanderthals were not inferior to modern humans, study finds

Posted: 30 Apr 2014 10:30 AM PDT

If you think Neanderthals were stupid and primitive, it's time to think again. The widely held notion that Neanderthals were dimwitted and that their inferior intelligence allowed them to be driven to extinction by the much brighter ancestors of modern humans is not supported by scientific evidence.

The intergalactic medium unveiled: Cosmic Web Imager directly observes 'dim matter'

Posted: 29 Apr 2014 03:50 PM PDT

Astronomers have taken unprecedented images of the intergalactic medium -- the diffuse gas that connects galaxies throughout the universe -- with the Cosmic Web Imager. Until now, the structure of the IGM has mostly been a matter for theoretical speculation. However, with observations from the Cosmic Web Imager, deployed on the Hale 200-inch telescope at Palomar Observatory, astronomers are obtaining our first three-dimensional pictures of the IGM.

Consuming high-protein breakfasts helps women maintain glucose control, study finds

Posted: 29 Apr 2014 01:21 PM PDT

Previous research has shown that extreme increases in glucose and insulin in the blood can lead to poor glucose control and increase an individual's risk of developing diabetes over time. Now, a researcher has found that when women consumed high-protein breakfasts, they maintained better glucose and insulin control than they did with lower-protein or no-protein meals.

Prehistoric caribou hunting structure discovered beneath Lake Huron

Posted: 29 Apr 2014 10:38 AM PDT

Underwater archaeologists have discovered evidence of prehistoric caribou hunts that provide unprecedented insight into the social and seasonal organization of early peoples in the Great Lakes region. The main feature, called Drop 45 Drive Lane, is the most complex hunting structure found to date beneath the Great Lakes.

People rely on what they hear themselves say to know what they're saying

Posted: 29 Apr 2014 09:57 AM PDT

You know what you're going to say before you say it, right? Not necessarily, research suggests. A new study shows that auditory feedback plays an important role in helping us determine what we're saying as we speak. Theories about how we produce speech often assume that we start with a clear, preverbal idea of what to say that goes through different levels of encoding to finally become an utterance. But the findings from this study support an alternative model.

Girls make higher grades than boys in all school subjects, analysis finds

Posted: 29 Apr 2014 07:49 AM PDT

Despite the stereotype that boys do better in math and science, girls have made higher grades than boys throughout their school years for nearly a century, according to a new analysis. "School marks reflect learning in the larger social context of the classroom and require effort and persistence over long periods of time, whereas standardized tests assess basic or specialized academic abilities and aptitudes at one point in time without social influences," said lead study author.

Simply being called 'fat' makes young girls more likely to become obese: Trying to be thin is like trying to be tall

Posted: 28 Apr 2014 01:41 PM PDT

Girls who are told by a parent, sibling, friend, classmate or teacher that they are too fat at age 10 are more likely to be obese at age 19, a new study by psychologists shows.

The thin-crusted U.S. Sierra Nevada Mountains: Where did the Earth go?

Posted: 28 Apr 2014 12:58 PM PDT

Scientist have examined the seismological study of the entire extent of the Sierra Nevada range using seismograms collected in the Sierra Nevada EarthScope field experiment from 2005 to 2007. The southern Sierra Nevada is known to have unusually thin crust for mountains with such high elevations (peaks higher than 4 km/14,000 ft, and average elevations near 3 km/10,000 ft). Scientists have used measurements of the arrival times of seismic waves (called P-waves) from earthquakes around the globe to image the earth under the Sierra Nevada and neighboring locations.

Mystery of the pandemic flu virus of 1918 solved

Posted: 28 Apr 2014 12:58 PM PDT

The mystery of the origin of the 1918 pandemic flu virus has been solved by researchers who found compelling evidence that its severity resulted from a mismatch between its surface proteins and prior immunity in certain age groups, which could inform future vaccine design and pandemic prevention. The results of the study suggest that the types of flu viruses to which people were exposed during childhood may predict how susceptible they are to future strains, which could inform vaccination strategies and pandemic prevention and preparedness.

Origin of Huntington's disease found in brain; insights to help deliver therapy

Posted: 28 Apr 2014 09:06 AM PDT

The gene mutation that causes Huntington's disease appears in every cell in the body, yet kills only two types of brain cells. Why? Scientists used a unique approach to switch the gene off in individual brain regions and zero in on those that play a role in causing the disease in mice. Their findings shed light on where Huntington's starts in the brain. It also suggests new targets and routes for therapeutic drugs to slow the devastating disease, which strikes an estimated 35,000 Americans.

The scent of a man: Gender of experimenter has big impact on rats' stress levels, explains lack of replication of some findings

Posted: 28 Apr 2014 09:06 AM PDT

Scientists' inability to replicate research findings using mice and rats has contributed to mounting concern over the reliability of such studies. Pain researchers have now found that the gender of experimenters has a big impact on the stress levels of rodents used in research. The presence of male experimenters produced a stress response in mice and rats equivalent to that caused by restraining the rodents for 15 minutes in a tube or forcing them to swim for three minutes. This stress-induced reaction made mice and rats of both sexes less sensitive to pain.

ADHD: Scientists discover brain's anti-distraction system

Posted: 18 Apr 2014 11:12 AM PDT

Psychologists have made a brain-related discovery that could revolutionize doctors' perception and treatment of attention-deficit disorders. This discovery opens up the possibility that environmental and/or genetic factors may hinder or suppress a specific brain activity that the researchers have identified as helping us prevent distraction.

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