August 1, 2013 A week out in nature — away from electrical lights — quickly resets the body's internal clock, scientists say. And it helps night owls who have problems waking up be more alert in the morning. The findings suggest some easy ways to help everyone hop out of bed with more energy.
July 4, 2013 The tiny organs created from stem cells aren't complete, but they act like regular livers when transplanted into mice, Japanese scientists say. Still, it will be years before the synthetic organs could help people with liver problems, even if further research all works out as hoped.
June 26, 2013 An experiment with runners in the Italian Alps finds that extremely long races don't always lead to more muscle fatigue than those that were merely very long. Smart pacing and strategic naps help ultramarathoners cope with the challenges.
June 26, 2013 The vast majority of the animals are used in studies of things like genetics and behavior. But in recent years, the scientific community has begun to feel even these studies are unnecessary.
June 18, 2013 Conventional wisdom holds that men prefer younger women as mates because they're more fertile than older women. But a mathematical analysis suggests that this preference may be the cause of menopause rather than a consequence of it.
June 14, 2013 Though the regulation proposed by the Fish and Wildlife Service would make it more difficult to use chimpanzees for research purposes, that may not be a problem, some scientists say. Scientific advances show the animals are less medically useful than previously thought.
June 12, 2013 Since the 1970s, doctors around the world have reported cases in which young kids regrow fingertips if an accident leaves some of the fingernail. Now scientists have figured out how this lizard-like regeneration happens in mice and suspect the same mechanism works in young humans.
May 23, 2013 Biologists said last week that they had overcome a major obstacle in stem-cell research by cloning human embryos. But several images in the published study were duplicated and labeled incorrectly, prompting questions about the authenticity of the results.
May 21, 2013 Engineers have figured out a way to get crystals to form rose and tulip sculptures, each smaller than a strand of hair. The gardens sprout up on a penny dipped in a salt solution. The technique is similar to 3-D printing and could one day be used to make any complex shape.
May 16, 2013 The news that scientists have successfully cloned a human embryo seems almost certain to rekindle a political fight that has raged, on and off, since the creation of Dolly the sheep. It's a fight that has, over the past decade and a half, produced a lot of heat and light and not a lot of policy.
May 15, 2013 After decades of trying, scientists say they've finally figured out how to make personalized embryonic stem cells. One day, these designer cells may help treat an array of diseases. A jolt of caffeine and and a little electric shock helped to do the trick.
May 9, 2013 Scientists used to think that identical twins turned out differently because they were treated differently by friends, teachers or their parents. A study of mice supports the idea that small changes in behavior can lead to larger ones and eventually even resculpt brains in different ways.