What seemed like a burden can become a gift. iStockphoto hide caption

itoggle caption iStockphoto

In epilepsy, the normal behavior of brain neurons is disturbed. The drug valproic acid appears to help the brain replenish a key chemical, preventing seizures. David Mack/Science Source hide caption

itoggle caption David Mack/Science Source

Taking care of a family member can be a life-extending experience, a study finds. iStockphoto.com hide caption

itoggle caption iStockphoto.com

With osteoarthritis, knees become swollen and stiff, and cartilage can degenerate. Ted Kinsman/Science Source hide caption

itoggle caption Ted Kinsman/Science Source

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

itoggle caption Jewel Samad/AFP/Getty Images

Does a glass or two of wine during pregnancy really increase the child's health risks? Epigenetics may help scientists figure that out. Katherine Streeter for NPR hide caption

itoggle caption Katherine Streeter for NPR

Niels Tietze leads a group of veterans of the wars in Afghanistan and Iraq up the Snake Dike route on the western wall of Yosemite National Park's Half Dome. David P. Gilkey/NPR hide caption

itoggle caption David P. Gilkey/NPR

Lauren Henderson and her service dog, Phoebe, in Los Angeles. Henderson says she's seeing more dogs in vests that don't appear to be legitimate service dogs. Lisa Napoli/KCRW hide caption

itoggle caption Lisa Napoli/KCRW

Devon Walker smiles with his teammates after the school's home opener in New Orleans. A former team captain, Walker was paralyzed from the waist down during a tackle last September. Courtesy of Tulane Athletics hide caption

itoggle caption Courtesy of Tulane Athletics

Members of the Bay Area Association of Disabled Sailors sail every weekend near San Francisco's Pier 40. The all-volunteer group serves people with a range of physical, developmental and mental disabilities. Emily Green for NPR hide caption

itoggle caption Emily Green for NPR