Bob Karch is the chairman and a professor in the Department of Health and Fitness at American University. Here, he helps cross-country champion Steve Hallinan check his heart rate while cross-training on the bike. Allison Aubrey/NPR hide caption

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How Revving Up Your Heart Rate, Even A Bit, Pays Off

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Studies show that only about 40 percent of health care workers in the U.S. wash their hands as often as they should. Rob Carr/AP hide caption

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Catching Hospital Workers Dirty-Handed

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A woman receives treatment in a U.S.-run emergency clinic in Port-au-Prince. John W. Poole/NPR hide caption

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Haiti Moves Past Broken Bones To Future Needs

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A barefooted runner takes to the streets. Charlie Riedel/AP hide caption

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Study: Humans Were Born To Run Barefoot

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According to a new study, people who smoke menthol cigarettes seem to have more difficulty quitting than those who smoke regular cigarettes. iStockphoto.com hide caption

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Menthol May Be Nicotine's Partner In Addiction

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The red specks highlight where the integrity of the brain's white matter is significantly less in the teens who binge drink, compared to those who do not. Courtesy of Susan Tapert/Tim McQueeny/UCSD hide caption

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Teen Drinking May Cause Irreversible Brain Damage

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FDA Cautions Against Chemical In Plastics

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Bryce Marcus is a fifth-grader at the KIPP Infinity School in the West Harlem neighborhood of New York City. His curriculum includes emotional development training that teaches him to replace negative thinking with more realistic and flexible thinking. Allison Aubrey/NPR hide caption

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Emotional Training Helps Kids Fight Depression

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Watching TV Could Shorten Your Life

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Many schools have made an effort to get rid of unhealthy snacks and educate students about nutrition. Elementary students in Gilbert, Ariz., check out the fruit and vegetable choices as a part of a school lunch program called "A to Z Salad Bar." Tim Hacker/AP/East Valley Tribune hide caption

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Obesity Rates Level Off, But Health Concerns Remain

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Is The Rest Of The World 'Crazy Like Us'?

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For Some, Lasik Brings More Problems Than Solutions

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The cornea and lens are responsible for focusing light on the retina. Vision problems are most often the result of an imperfectly shaped eyeball, cornea or lens that prevents light from being properly focused within the eye. National Eye Institute hide caption

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Medical Detectives Focus On Myopia

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Obesity Trumps Smoking As American Health Burden

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Meds May Help Only Those With Severe Depression

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