Some men take testosterone hoping to boost energy and libido, or to build strength. But at what risk? iStockphoto hide caption

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The superglue developed by scientists sticks to wet, bloody surfaces. Researchers hope the adhesive could one day seal a torn vessels or fix heart defects. Randal McKenzie / McKenzie Illustrations. hide caption

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Martine Rothblatt, CEO of United Therapeutics, is the namesake of the company's latest drug, Orenitram. Ron Levine/Getty Images hide caption

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Some people with only slightly elevated blood pressure might be able to relax a bit, if they're doctors go along new treatment guidelines. iStockphoto hide caption

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Gym members warm up on treadmills at Downsize Fitness in Addison, Texas. Membership at the gym is limited to people who have a high body mass index. LM Otero/AP hide caption

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Regular nut consumers had about a 20 percent reduction in all-cause mortality, including lower death rates from heart disease and cancer, a study found. iStockphoto hide caption

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A third of Americans have high blood pressure, according to the Centers for Disease Control. Half of them don't have it under control. iStockphoto.com hide caption

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Statin drugs to lower cholesterol have become among the most widely prescribed prescription medications in the United States. Bill Gallery/ASSOCIATED PRESS hide caption

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Just knowing that someone is obese doesn't mean they would benefit from bariatric surgery, doctors say. iStockphoto.com hide caption

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Spiffing up the garden may also make your cardiovascular risk profile look better, too. Lauren Mitchell/Flickr hide caption

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Sen. Mark Kirk, R-Ill., gets help entering the Capitol from Vice President Joe Biden (right) in January 2013, one year after suffering a stroke at age 52. Jewel Samad/AFP/Getty Images hide caption

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Gaining a few more years of healthy life would be great for individuals, but expensive for Medicare, researchers say. iStockphoto.com hide caption

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