Health

Polio was eliminated from the Western Hemisphere in the early 1990s. It was stamped out in Europe a few years later. And now, even the Congo and Somalia are polio free.

But in Africa's largest oil-producing nation, Nigeria, polio has been a difficult, contentious foe.

Adolescent brains have gotten a bad rap, according to neuroscientists.

It's true that teenage brains can be impulsive, scientists reported at the Society for Neuroscience meeting in New Orleans. But adolescent brains are also vulnerable, dynamic and highly responsive to positive feedback, they say.

Sixty years ago, polio was one of the most feared diseases in the U.S.

As the weather warmed up each year, panic over polio intensified. Late summer was dubbed "polio season." Public swimming pools were shut down. Movie theaters urged patrons not to sit too close together to avoid spreading the disease. Insurance companies started selling polio insurance for newborns.

The fear was well grounded. By the 1950s, polio had become one of the most serious communicable diseases among children in the United States.

Giving the human papillomavirus vaccine to teenage girls doesn't increase the likelihood that they will be sexually active, according to a new study.

That may help put parents at ease; the notion of vaccinating 11- and 12-year-old girls for a sexually transmitted virus has made some uncomfortable, and is one reason why only a little more than half of teenage girls have had the vaccine.