Caduceus with Rock Hammer (IMAGE) Arizona State University Caption This image of the Caduceus, a century-old symbol of medicine, merged with a rock hammer, the traditional symbol of geology, illustrates the research by scientists at Arizona State University and NASA who are developing a new approach to the medical challenge of detecting bone loss by applying a technique that originated in the Earth sciences. Credit Susan Selkirk/School of Earth and Space Exploration/Arizona State University Usage Restrictions With proper credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.