Researchers and Machines (IMAGE) Duke University Caption Joel Greenberg (left) and Michael Gehm (right) have been tapped by the Department of Homeland Security to develop a new type of x-ray scanner for airport security. Credit Joel Greenberg Usage Restrictions None 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.