Researchers at the U.S. Department of Energy's Idaho National Laboratory say they have devised an inexpensive way to produce plastic sheets containing billions of nanoantennas that collect heat energy generated by the sun and other sources.

They say this technology is the first step toward a solar energy collector that could be mass-produced on flexible materials.

Traditional solar cells rely on a chemical reaction that only works for up to 20 percent of the visible light they collect. Scientists have developed more complex solar cells with higher efficiency, but these models are too expensive for widespread use.

Scientists at the University of California, Berkeley, have for the first time engineered 3-D materials that can reverse the natural direction of visible and near-infrared light, a development that could help form the basis for higher resolution optical imaging, nanocircuits for high-powered computers, and, to the delight of science-fiction and fantasy buffs, cloaking devices that could render objects invisible to the human eye.

Two breakthroughs in the development of metamaterials - composite materials with extraordinary capabilities to bend electromagnetic waves - are reported separately this week in the Aug. 13 advanced online issue of Nature, and in the Aug. 15 issue of Science.

A study of 228 women has revealed genetic variants responsible for body shape, according to research published in BMC Genetics.

Based on work in the fruit fly Drosophila melanogaster, the study identifies natural variation in the human LAMA5 gene as a key determinant of weight.

As the prevalence of obesity and related health problems continues to increase worldwide, there is considerable effort being devoted to identify genetic mechanisms that control fat storage. Maria De Luca led a team from the University of Alabama at Birmingham, USA, who identified candidate genes using different strains of Drosophila.

Scientists have discovered a new species of bacteria in the mouth. The finding could help scientists to understand tooth decay and gum disease and may lead to better treatments, according to research published in the August issue of the International Journal of Systematic and Evolutionary Microbiology.

"The healthy human mouth is home to a tremendous variety of microbes including viruses, fungi, protozoa and bacteria," said Professor William Wade from King's College London Dental Institute. "The bacteria are the most numerous: there are 100 million in every millilitre of saliva and more than 600 different species in the mouth. Around half of these have yet to be named and we are trying to describe and name the new species."

Sustainable development thinking got environmental issues onto the agenda but it may now be stopping us from taking serious action on climate change and other crucial planetary issues, argues John Foster, a freelance writer and teacher and honorary Research Fellow in Philosophy at Lancaster University, UK in his new book "The Sustainability Mirage: Illusion and Reality in the Coming War on Climate Change."

Sustainable development's attempted deal between present and future will always collapse under the pressure of 'now' because the needs of the present always win out, he says. Inevitably, this means movable targets and action that will always fall short of what we need. Ultimately, sustainable development is the pursuit of a mirage, the politics of never getting there.

As people age, their cells become less efficient at getting rid of damaged protein, resulting in a buildup of toxic material that is especially pronounced in Alzheimer's, Parkinson's disease, and other neurodegenerative disorders.

Scientists at the Albert Einstein College of Medicine of Yeshiva University have prevented this age-related decline in an entire organ — the liver — and shown that, as a result, the livers of older animals functioned as well as they did when the animals were much younger.

These findings suggest that therapies for boosting protein clearance might help stave off some of the declines in function that accompany old age.

Computing pundits claim that we are moving into a world of ubiquitous computing, a brave new world where your refrigerator and cupboards will be connected to your internet shopping accounts so that you never run out of milk or sugar again. Sensors around your home and workplace will respond to workloads, weather and even your mood by adjusting heating, lighting, and sound levels. Diagnostic devices built into door handles or the bathroom might alert your doctor or the emergency services to changes in your health.

But doing that means getting rid of your iPhone and anything else you learned how to use. Instead, this this emerging technology will only be woven into the fabric of society and our everyday living spaces when people, rather than computer screens and keyboards, are projected into the foreground.

Do volunteers who take part in conservation efforts do it for the wildlife they are trying to protect or just to impress their friends and because they like the way wildlife looks on their property? A University of Alberta case study says it is not altruism that drives them.

A study of purple martin landlords, those who keep and monitor special birdhouses on their land, revealed that they were more motivated to take part in the conservation project for egoistic rather than altruistic reasons.

"Though there were areas of overlap, we found that common motivations for self-benefit included interaction with the birds, a sense of achievement, social interaction, personal stimulation and enjoyment," said Glen Hvenegaard, a co-author on the qualitative study and a professor of geography and environmental studies at the University of Alberta's Augustana campus in Canada.