The protective shells that have helped keep turtles around for millions of years have also kept scientists guessing about just what's going on inside. With support from the National Science Foundation (NSF), biologist Elizabeth Brainerd and her team at Brown University have developed X-ray Reconstruction of Moving Morphology, or XROMM, a new technology that combines CAT scan and X-ray technology for visualizing bones and joints in motion, in both animals and humans.