Michael Wand of the Cognitive Systems Laboratory at the Karlsruhe Institute of Technology in Germany demonstrates a technology that recognizes speech through muscle activity in the face rather than sound. Gretchen Cuda for NPR hide caption

itoggle caption Gretchen Cuda for NPR

An X-ray of Schneider's right femur (thighbone), which broke suddenly as she was standing on a New York subway train. Courtesy of Dr. Jennifer Schneider hide caption

itoggle caption Courtesy of Dr. Jennifer Schneider

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