Nancy Shute

The science is clear that teenagers need more than eight hours of sleep a night. The nation's pediatricians say school districts need to buck up and change schedules to let kids sleep later.

Nobody knew how people in Southern California were getting infected with the life-threatening fungus C. gattii. A 13-year-old helped figure out the source: three types of trees.

Older people whose visual acuity has slipped by just one letter on the eye chart are more likely to die sooner, researchers say. New glasses may be all it takes to maintain independence.

Jesse Saperstein says he made lots of mistakes while dating as a young man with Asperger's. He hopes his hard-won experience will help others tell the difference between enthusiasm and stalking.

Pretty much everyone thinks that rewards bring happiness, but it's not the size of the payoff that matters, researchers say. Rather it's whether the reward exceeds your immediate expectations.

The federal Centers for Disease Control and Prevention has ordered health care providers to test recent travelers at risk for Ebola virus. So far none of those tests have come up positive.

If all goes according to plan, patients with Ebola virus will soon enter the United States. How does a hospital care for critically ill patients while protecting other patients, staff and the public?

Most people can't tell when they're having the irregular heartbeat called atrial fibrillation that puts them at risk of stroke. Simply learning to take your own pulse could help, researchers say.

There's plenty of evidence that playing with a concussion increases the risk of long-term problems. But athletes, coaches and parents can be reluctant to call a halt. Then how can doctors do no harm?

Earlier safety studies of the vaccine for human papillomavirus found a higher risk of dangerous blood clots. But a study of 500,000 women and girls finds that the vaccine doesn't raise risk.