It takes a few moments to notice the dent on the top of Sgt. Dan Powers' head, a place where he was stabbed with a nine-inch blade while patrolling the streets of the Iraqi capital.

Do's and don'ts of cold and flu season

With cold and flu season comes time-honored traditions for relief and prevention: Feed a fever, starve a cold. Wear warm clothes. Eat chicken soup. But just because those instructions have been around for decades doesn't necessarily mean they're effective.

Study: Blood thinner shows promise, pitfalls

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5 million pizzas recalled on E. coli fears

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Doctors warned to look out for lead poisoning

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