Tuan and Nguyen (IMAGE) University of Nebraska-Lincoln Caption University of Nebraska engineers Christopher Tuan (left) and Lim Nguyen have developed a cost-effective concrete that shields against damaging electromagnetic energy. They are standing beside a test structure at Nebraska's Peter Kiewit Institute in Omaha. Credit Craig Chandler/University Communication/University of Nebraska-Lincoln 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.