Kim-Silk (IMAGE) Purdue University Caption New research suggests fibers from a silkworm's cocoon may represent "natural metamaterials," a discovery with various technological and scientific implications. Credit Purdue University image/Young Kim 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.