

toggle caption Courtesy of Mark Dastrup

Truckers are more likely than average Americans to be overweight, which can lead to health problems including sleep apnea. Deborah Davis/Getty Creative hide caption

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This composite image of brain scans shows two traits of a highly impulsive individual. The cool colors in the midbrain are indicative of a decrease in dopamine receptor levels while the warm colors show elevated levels of dopamine in a different part of the brain called the striatum. Joshua W. Buckholtz and David H. Zald hide caption

toggle caption Joshua W. Buckholtz and David H. Zald

Medical professionals need to build a system that focuses on how to help patients achieve what's most important to them at the end of their lives, says Dr. Atul Gawande. hide caption

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A woman performs chest compressions on a mannequin while learning CPR on the steps of San Francisco City Hall. Justin Sullivan/Getty Images hide caption

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