Hair Device (IMAGE) University of Wisconsin-Madison Caption UW-Madison Materials Science and Engineering Professor Xudong Wang (left) and colleagues developed an device -- unobtrusive enough to fit under a cap -- that harnesses energy from the wearer and delivers gentle electric pulses to stimulate dormant hair follicles and regrow hair. Credit UW-Madison photo by Sam Million-Weaver. 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.