30-nanometer Particle (IMAGE) University of Washington Caption The 30-nanometer particle consists of a magnetic core and a thin gold shell, analogous to an eggshell, that surrounds but does not touch the center. Credit Xiaohu Gao, University of Washington 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.