Eryn Brown

Children who are exposed to violence experience wear and tear to their DNA that is similar to that seen in aging, according to a new study that may help explain why they face a heightened risk of mental and physical disorders as adults.

It turns out plastic surgery really does make you look younger, one study has found -- on average, in the case of one Canadian doctor's patients, 7.2 years younger.

"Well, here it is," said aerospace engineer William Ailor as he paused next to the hulking metal shells arrayed along the plaza outside a visitor entrance at Aerospace Corp.'s El Segundo, Calif., headquarters.

The stuff is junk. But, Ailor said, it's no ordinary junk. This garbage has traveled to space and back.

A 150-pound hollow sphere of blackened titanium is all that remains of a motor casing from a Delta II rocket that fell to Earth in 2001, landing in the Saudi Arabian desert west of Riyadh.

Fourteen-year-olds who were frequent video gamers had more gray matter in the rewards center of the brain than peers who didn't play video games as much -- suggesting that gaming may be correlated to changes in the brain, much as addictions are.

European scientists reported the discovery Tuesday in the journal Translational Psychiatry. Psychologist Simone Kuhn of Ghent University in Belgium and colleagues recruited 154 healthy 14-year-olds in Berlin and divided them into two groups. Twenty-four girls and 52 boys were frequent gamers who played at least nine hours of video games each week. Fifty-eight girls and 20 boys were infrequent gamers, who played less than nine hours a week.

There’s a lot you can read about on Twitter — including, it now appears, the patterns of human moods.

Watching just a short bit of the wildly popular kids TV show "SpongeBob SquarePants" has been known to give many parents headaches. Psychologists have now found that a brief exposure to SpongeBob, Patrick, Squidward and the rest of the crew also appears to dampen preschoolers' brain power.

Angeline Lillard and Jennifer Peterson, both of the University of Virginia's department of psychology, wanted to see whether watching fast-paced television had an immediate influence on kids' executive function -- skills including attention, working memory, problem solving and delay of gratification that are associated with success in school.

Television's negative effect on executive function over the long term has been established, the researchers wrote Monday in the journal Pediatrics, but less is known about its immediate effects.

How did lager beer come to be? After pondering the question for decades, scientists have found that an elusive species of yeast isolated in the forests of Argentina was key to the invention of the crisp-tasting German beer 600 years ago.

It took a five-year search around the world before the scientific team discovered, identified and named the organism, a species of wild yeast called Saccharomyces eubayanus that lives on beech trees.