New observations from NASA's Mars Reconnaissance Orbiter indicate that the crust and upper mantle of Mars are stiffer and colder than previously thought.

The findings suggest any liquid water that might exist below the planet's surface and any possible organisms living in that water, would be located deeper than scientists had suspected.

"We found that the rocky surface of Mars is not bending under the load of the north polar ice cap," said Roger Phillips of the Southwest Research Institute in Boulder, Colo. Phillips is the lead author of a new report appearing in this week's online version of Science. "This implies that the planet's interior is more rigid, and thus colder, than we thought before."

Does playing violent video games make players aggressive? It is a question that has taxed researchers, sociologists, and regulators ever since the first console was plugged into a TV and the first shots fired in a shoot ‘em up game.

Writing today in the International Journal of Liability and Scientific Enquiry, Patrick Kierkegaard of the University of Essex, England, suggests that there is scant scientific evidence that video games are anything but harmless and do not lead to real world aggression. Moreover, his research shows that previous work is biased towards the opposite conclusion.

Video games have come a long way since the simplistic ping-pong and cascade games of the early 1970s, the later space-age Asteroids and Space Invaders, and the esoteric Pac-man. Today, severed limbs, drive-by shootings, and decapitated bodies captivate a new generation of gamers and gruesome scenes of violence and exploitation are common.

NASA held a press conference today to announce the discovery of a discovery of the most recent supernova in our galaxy. The discovery was made by tracking the rapid expansion of its remains.

The supernova explosion occurred about 140 years ago, making it the most recent supernova in the Milky Way as measured in Earth's time frame. Previously, the last known galactic supernova occurred around 1680, based on studying the expansion of its remnant Cassiopeia A.

The tracking of this source began in 1985 when astronomers, led by David Green of the University of Cambridge, used the VLA to identify G1.9+0.3 as the remnant of a supernova explosion near the center of our galaxy. Based on its small size, it was thought to have resulted from a supernova that exploded about 400 to 1000 years ago.

Do black NBA coaches have a harder time getting hired and an easier time getting fired? Not according to a new University of Michigan study, though it did find that white coaches with losing records got slightly longer opportunities before being fired than black coaches.

The study found no difference in "technical efficiency" by race of coach, and found no evidence that there are differences in firings based on race, says lead researcher Rodney Fort, U-M professor in the Division of Kinesiology.

Fort claims the NBA is the most integrated professional sport, so the results are not all that surprising. The study says the market for coaches in the NBA works like any other healthy labor market is ideally supposed to work - coaches must win. The researchers used a scoring system to calculate current coach's value, or technical efficiency, by how many wins were produced.

Mice and humans have genomes that are 85% identical, making them suitable and cost-effective stand-ins for humans in medical research. A recent article by University of Michigan evolutionary biologists Ben-Yang Liao and Jianzhi Zhang discussed how identical genes may behave differently in mice and men - and some essential to humans aren't missed at all by mice.

"Everyone assumes that deletion of the same gene in the mouse and in humans produces the same phenotype (an observable trait such as presence or absence of a particular disease). That's the basis of using the mouse to study human disease," said Zhang, an associate professor of ecology and evolutionary biology.

Infants and toddlers whose mothers are severely depressed are almost three times more likely to suffer accidental injuries than other children in the same age group, according to a new study. The study’s findings, published today in the Advanced Access edition of the Journal of Pediatric Psychology, suggest that proper treatment for depression would improve not only the mothers’ health, but the health of young children as well.

Prior studies have shown that mothers who reported symptoms consistent with clinical depression had children who experienced a significant number of accidental injuries between the ages 3 months to 2 years.

In his study, UAB psychologist David Schwebel, Ph.D., director of the UAB Youth Safety Lab, examined the difference between mothers with severe, chronic depression and those who were moderately depressed as their children grew from birth to first grade.