Sepulveda and Li (IMAGE) Michigan State University Caption Michigan State University scientists Nelson Sepulveda, right, and Wei Li created a groundbreaking nano-device that can both harvest energy from human motion and serve as a loudspeaker. Credit Michigan State 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.