The One World Trade Center (IMAGE) Fraunhofer-Gesellschaft Caption This image portrays the One World Trade Center at Ground Zero shortly before the official opening. One safety measure adopted was the use of specially formulated safety concrete, developed by DUCON Europe GmbH & CO KG. Fraunhofer scientists were able to accurately compute how much of this concrete could be efficiently used to best effect. Credit © Fraunhofer EMI Usage Restrictions The picture may be used for editorial purposes only. It is protected by copyright. The use is free of charge if the reference is mentioned. 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.