How long can a four-year-old sit in a room with a cookie on the table? The answer depends on how much self-control the four-year-old has.

It's been thirty years since AIDS began teaching a hard lesson about the importance of safe sex. And yet, some people haven't learned. So what – if anything – can protect them from HIV?

Can anorexics see body size accurately? In a test, anorexics saw other people as their actual size, but saw themselves as larger than they actually were.

Which comes first: binge drinking or unemployment? Is binge drinking behavior different for women than it is for men? Read on for answers.

Dipping or using chew may not cause lung cancer, but oral cancer is still a big risk. Smokeless tobacco products have nitrosamines , which can cause cancer at high levels.

Besides transplant, dialysis is the only way to keep a kidney failure patient alive. While dialysis may be lifesaving, it can lead to infection. Luckily, there are drugs to treat such infections.

Treating addiction to painkillers may start with electronic monitoring of prescriptions. Doctor shopping and selling excess prescriptions may be a thing of the past.

Cancer cells are really smart. They can hide out during treatment. Or they can resist treatment only to appear later. They can also avoid the body's defense system. Brain cancer researchers may have found a way to outsmart these smart cells.

Drugs are often used to help memory in people with dementia. New research is looking into ways a hormone may help people with dementia too. A recent study found that taking a hormone, which is a natural part of the body’s function, improved thinking skills for elderly people.