New research shows that even affluent college students who don't need resources will still attempt to trade sexual currency for provisions, said Daniel Kruger, research scientist at the University of Michigan School of Public Health.

The exchange of resources for sex, referred to by scientists as 'nuptial gifts', has occurred throughout history in many species, including humans, Kruger said. The male of the species offers protection and resources to the female and offspring in exchange for reproductive rights.

Female penguins mate with males who bring them pebbles to build egg nests. Hummingbirds mate to gain access to the most productive flowers guarded by larger males. In humans, an arranged marriage might be considered a contract to trade resources, he said.

Married men do less of it than live-in boyfriends but they do twice as much as they did 20 years ago and now it's linked to mental health. What is this magical creation?

Housework.

Not just housework, but really any 20 minutes of physical activity, including the housework we all have to do anyway, is enough to boost mental health, reveals a large study published in the British Journal of Sports Medicine.

If the aging process can’t be stopped, it can at least be predicted, say researchers from Tel Aviv University.

They have developed a new biological marker that represents the age of a body’s bones. It reveals that the speed of physical aging is strongly influenced by genetics.

Christened the osseographic score (OSS), this new marker can be used by doctors as a scientific tool for predicting a person’s general functioning and lifespan, says Tel Aviv University scientist Dr. Leonid Kalichman, an instructor at The Stanley Steyer School of Health Professions. He is a co-author of the study published in Biogerontology and the American Journal of Human Biology (2007), which was conducted in partnership with Dr. Ida Malkin and Prof. Eugene Kobyliansky, both from the Sackler Faculty of Medicine at Tel Aviv University.

A study published in the April 2008 issue of The American Journal of Clinical Nutrition(1) suggests an association between high egg consumption and all-cause mortality and the response from the American Egg Board is below.

The researchers, Djoussé and Gaziano, analyzed data from the Physicians Health Study I which followed male physicians over a 20 year period. As an epidemiological study, it does not show cause-and-effect and has other inherent weaknesses, the Egg Board response says.

The researchers did not control for a variety of factors including intake of other foods and nutrients including saturated fat. In addition, the high egg consumers exhibited other lifestyle and dietary patterns associated with increased health risks.

The National Grid Service in the UK and the TeraGrid in the U.S. have joined forces to help University College London (UCL) scientists shed light on how life on Earth may have originated.

Deep ocean hydrothermal vents have long been suggested as possible sources of biological molecules, such as RNA and DNA, but it was unclear how they could survive the high temperatures and pressures that occur round these vents.

Peter Coveney and colleagues at the UCL Centre for Computational Science have used computer simulation to provide insight into the structure and stability of DNA while inserted into layered minerals.

A new study suggests that a genetic fingerprint associated with normal embryonic stem cells may be important for the development and function of cancer stem cells. The research in Cell Stem Cell demonstrates that embryonic stem cells and multiple types of human cancer cells share a genetic expression pattern that is repressed in normal differentiated cells, a finding that may have significant clinical implications for cancer therapeutics.

“Self-renewal is a hallmark of stem cells and cancer, but existence of a shared stemness program remains controversial,” explains study co-author, Dr. Howard Y. Chang from Stanford University. Dr. Chang, Dr.

Scientists have discovered a possible terrestrial-type planet orbiting a star in the constellation Leo. The new planet lies at a distance of 30 light years from the Earth and has a mass five times that of our planet but is the smallest found to date. One full day on the new planet would be equivalent to three weeks on Earth.

A team of astronomers from the Spanish Research Council (CSIC) working with Dr Jean-Philippe Beaulieu, a visiting astrophysicist at University College London (UCL), made the discovery from model predictions of a new exoplanet orbiting a star in the constellation of Leo. Simulations show that the exoplanet, dubbed GJ 436c, orbits its host star (GJ 436) in only 5.2 Earth days, and is thought to complete a revolution in 4.2 Earth days, compared to the Earth’s revolution of 24 hours and full orbit of 365 days.

Inter-country adoptions are causing a rise in the number of children in orphanages in EU countries, say psychologists at the University of Liverpool.

More adoptions are leading to higher numbers of children in institutions, says the study, because in EU countries such as France and Spain, people are choosing to adopt healthy, white children from abroad rather than children in their own country who are mainly from ethnic minorities.

Researchers found that EU countries with high proportions of international adoptions also had the highest rates of children living in institutions. High adoption did not reduce the number of children in institutional care but they say instead attributed to an increase.

Open Knowledge, cyber-activism and social uses of technologies are some of the topics that Dutch Media theorist and activist Geert Lovink likes to tackle. He is Associate Professor in the Media & Culture department at the University of Amsterdam and holds a PhD from the University of Melbourne. He is founder and director of the Institute of Network Cultures and co-founder of Internet projects such as The Digital City, Nettime, Fibreculture and Incommunicado. Lovink is also the author of "Dark Fiber", which has been translated into Italian, Spanish, Romanian, German and Japanese.

Lovink visited Spain this week to talk about ‘The politics of open knowledge production’ at El Círculo de Bellas Artes in Madrid, and ‘About critic culture in the Internet’ in Seville at Zemos98 Festival and Enrique Sacristan from Servicio de Informacion y Noticias Cientificas(SINC) conducted this interview: