Gastric bypass procedures (GBP) divide the stomach into a small "gastric" pouch and a much larger, lower "bypassed" pouch. The operation makes the stomach smaller and makes the patient feel full faster. /Ethicon Endo-Surgery Inc. hide caption

itoggle caption /Ethicon Endo-Surgery Inc.

An elderly couple holds hands while walking along a Berlin street. A recent study showed that walking grows the region of the brain that archives memories. Patrick Sinkel/AFP via Getty Images hide caption

itoggle caption Patrick Sinkel/AFP via Getty Images

Sandy Palais, 73, of Arizona started lifting weights about 10 years ago after she was diagnosed with osteoporosis. Jason Millstein for NPR hide caption

itoggle caption Jason Millstein for NPR

Does knowing the nutritional info for food options influence your choice? A McDonald's Egg McMuffin makes its case. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

According to the Bureau of Labor Statistics, 47 percent of moms were in the labor force in 1975. By 2008, that number rose to 71 percent. James Tutor/iStockphoto.com hide caption

itoggle caption James Tutor/iStockphoto.com

Malcom Brown (left) is hit by Jake Smith on a kickoff return during a high school state championship game in Arlington, Texas, in December. Sports medicine professionals and the NFL are calling for tougher regulations on head injuries sustained by young athletes. Matt Strasen/AP hide caption

itoggle caption Matt Strasen/AP