In the study, muscle cells were injected into the cell-free "scaffolding" of a rat limb, which provided shape and structure onto which regenerated tissue could grow. Bernhard Jank, MD/Ott Laboratory, Massachusetts General Hospital Center for Regenerative Medicine hide caption

itoggle caption Bernhard Jank, MD/Ott Laboratory, Massachusetts General Hospital Center for Regenerative Medicine

Lively is a sensor that can be attached to a pill box, keys or doors. It lets people know whether aging parents are taking their medicines or sticking to their routines. Courtesy of Lively hide caption

itoggle caption Courtesy of Lively

Doctors used a rapid DNA test to identify a Wisconsin teen's unusual infection with Leptospira bacteria (yellow), which are common in the tropics. CDC/Rob Weyant hide caption

itoggle caption CDC/Rob Weyant

The Liftware device, shown here as an early prototype (left) and the final design, starts up automatically when it's lifted from the table. There's no "on" switch to fumble with. Ina Jaffe/NPR hide caption

itoggle caption Ina Jaffe/NPR