About 40,000 years ago, bacteria in the stomachs of Japanese people evolved to digest nori, the seaweed that's used to wrap maki rolls. But the average person from North America doesn't carry this version of the microbe. iStockphoto.com hide caption

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A recent report found that 85 percent of people who see doctors regularly have undiagnosed and uncontrolled high blood pressure. Joe Raedle/Getty Images hide caption

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For athletes and nonathletes alike, stretching to keep muscles limber may help prevent cramping later in life. Ian Stewart/AP hide caption

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Pugil stick training at Fort Jackson in Columbia, S.C., is part of the Army's overhauled basic training program. Brett Flashnick/AP hide caption

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Scientists are working to understand what hormonal and physiological cues in the body lead the brain to respond to food emotionally. iStockphoto.com hide caption

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