Sleeping too much could raise risk of stroke

Adults who sleep more than eight hours a night may face a higher risk of stroke, a new analysis suggests. These so-called "long sleepers" were 46 percent more likely to have a stroke than those who got only six to eight hours of sleep a night, the researchers found. However,...

A new understanding of Alzheimer's

Although natural selection is often thought of as a force that determines the adaptation of replicating organisms to their environment, Harvard researchers have found that selection also occurs at the level of neurons, which are post-mitotic cells, and plays a critical role...