Probing the myth that 'light' cigarettes are better for you.

Sure, we know the holiday leaves us stuffed. But it's not just the extra calories that make us groggy.

How a middle-aged doctor wound up on the battlefield in Iraq.

Maryland school officials are taking parents to court for refusing to inoculate their kids. Could other districts follow suit?

What happens when the gift of life comes with complications? Recent cases of HIV transmission via organ transplants have doctors rethinking what they should tell patients about their donors.

When the sniffles strike, many of us reach for a glass of orange juice or a vitamin C supplement. But are they really effective?

The former 'Charlie's Angel' star battles a disease that's rare but on the rise.

The valuable lesson Sandra Day O'Connor has taught us about Alzheimer's.

Women make up a growing percentage of new cases, so why are so many doctors still treating it like it's only a male disease?

4 transplant recipients get AIDS virus from donor; first known transplant case in US since '94

Whether you're a sporadic jogger or a dedicated sprinter, it's easy to slip into some bad habits. Here's how to avoid the most common ones.

Whether you're a sporadic jogger or a dedicated sprinter, it's easy to slip into some bad habits. Here's how to avoid the most common ones.

A Harvard neurologist takes on the human nervous system and some of nature's most baffling diseases.

The fear of developing 'manboobs' surely strikes at the heart of men. What causes some men to develop breasts, and how it can be treated.

Nearly a quarter of all teens smoke, and only 4 percent manage to quit. But there may be good news this week on both the cessation and prevention fronts.

Former Intel CEO Andrew S. Grove says the pharmaceutical industry could learn a lot from the computer and chip businesses.

It's 1 p.m. at Mercer Elementary School in Shaker Heights, Ohio, and Lena Paskewitz's kindergarten class is filled with the happy hum of kids getting ready for their favorite part of the day: lunch. Caleigh Leiken, 6, is toting a pink Hello Kitty bag her mom has packed with goodies: strawberry yogurt, string cheese, some veggies and a cookie. But there's one childhood staple missing—a PB&J. Caleigh was diagnosed with a peanut and tree-nut allergy when she was just 7 months old. Nuts are a no-no at her table in the Mercer lunchroom. Her allergy-free friends can sit there, but only if their lunches have been stored in a special bin and carefully inspected by the teacher.

Lots of us carry little bottles of these alcohol-based gels to use as an alternative to hand washing, but do they work as well as soap and water?

Each catastrophe teaches psychologists more about how the mind copes.

New research reveals the biological roots of positive thinking. How a rosy outlook can affect your health.

Our war on microbes has toughened them. Now, new science tells us we should embrace bacteria.

Infertility is more difficult to diagnose and treat in men than in women, but new genetic research may lead to revolutionary remedies.

Economists and psychologists—and the rest of us—have long wondered if more money would make us happier. Here's the answer.

Economists and psychologists—and the rest of us—have long wondered if more money would make us happier. Here's the answer.

 Some nifty studies help explain how humans cope with the fact that death is inevitable. You owe your unconscious a great big thank-you.

There are no easy answers when parents with young kids become seriously ill. How new strategies help families cope.

There are no easy answers when parents with young kids become seriously ill. How new strategies help families cope.

Think you're doing yourself a favor by going with a 'healthy' restaurant entree or a 'diet' snack? Think again.