Concept 3-D Printed Metamaterial Block (IMAGE) Duke University Caption An illustration of how 3-D-printed metamaterial unit cells could be combined like Lego blocks to create structures that bend or focus microwave radiation more powerfully than any material found in nature. Credit Abel Yangbo Xie, Duke University 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.