Acoustic Cloak (1 of 2) (IMAGE) Duke University Caption Bogdan Popa, a graduate student in electrical and computer engineering, shows off the 3-D acoustic cloak he helped design and build as a member of Steven Cummer's laboratory. Credit 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.