Studies suggest that smoking heavily in adolescence may affect brain function in adulthood, but there's a dearth of hard evidence for voters contemplating pot's long-term effects.

A Wisconsin clinic provides free dental care so that poor rural residents can get their teeth fixed. But in most states people aren't so lucky. Millions of people have no access to dental care.

Berlin has become a vegan mecca, with ice cream shops, restaurants and even butchers catering to a plant-based diet. Now Germany's nutritionists warn that a vegan diet can't provide all a body needs.

A deadly fungus is devastating frog populations around the world. In California, scientists are racing to find a way to immunize one species, mountain yellow-legged frogs, against the fungus.

Giving a heads-up about potentially objectionable content seems to be common teaching practice. That's one finding from our unscientific survey of more than 800 faculty members.

The mission aims to circle a hill-sized asteroid for two years, then skim its surface and bring a hearty sample of 4.5 billion-year-old dirt back to Earth.

Muslim Americans are more engaged in public life, and interfaith outreach efforts expanded notably after Sept. 11. But terrorism concerns continue to drive anti-Islam and anti-foreigner sentiment.

Earlier studies suggested that most people put the pounds back on. But a large study that followed people for a decade found that the vast majority didn't gain weight.

The dressing is the subject of rival origin stories. One features a romantic billionaire, the other a Hollywood actress and a humble fishing guide.

One state has built a safety net that sends a child-behavior expert to any daycare or pre-K that's having trouble with a disruptive child.