Researchers tested the antidepressant Lexapro, or escitalopram generically, to see if it would protect the heart against mental stress. Joe Raedle/Getty Images hide caption

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When Melissa McCann (left) suffered a stroke in 2007, her twin sister, Terry Blanchard, helped her make a full recovery. McCann is now back to work as a flight nurse with Life Flight at the Eastern Maine Medical Center in Bangor. David Wright/Redux Pictures for NPR hide caption

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Students at the College of Central Florida in Ocala, Fla., perform CPR on a mock patient. Bruce Ackerman/Ocala Star-Banner /Landov hide caption

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A 3-D reconstruction of Mummy 38's CT scans shows calcification in her aorta and iliac arteries. Courtesy of The Lancet hide caption

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ATLANTIC CITY, NJ - JULY 8: The roulette wheel spins at Caesars Atlantic City July 8, 2006 in Atlantic City, New Jersey. Caesars, along with Atlantic City's 11 other casinos reopend this morning after they were forced to close their gambling floors for the first time in their 28-year history due to the New Jersey state budget impasse. (Photo by William Thomas Cain/Getty Images) William Thomas Cain/Getty Images hide caption

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An angiogram of a 48-year- old patient after treatment for a stroke. A blockage was targeted with clot-busting drugs using a catheter. Zephyr/Science Source hide caption

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Maribel Ramos, 13, has both sickle cell disease and an abnormality of blood vessels called moyamoya. Both put her at risk of stroke, and, together, they add up to a 95 percent chance of a major stroke. Richard Knox/NPR hide caption

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Before filling one of these tubes with blood for a cholesterol test, you're supposed to keep your stomach empty. But that may not be necessary. Nancy Louie/ hide caption

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This gentleman may want to have a chat with his cardiologist. Bill Losh/Getty Creative Images hide caption

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