Pulsing on Demand (IMAGE) Saarland University Caption The first touchscreen that taps back: Engineers Sophie Nalbach and Steffen Hau from Stefan Seelecke's team test the prototype system that will be exhibited at Hannover Messe. Credit Credit: Oliver Dietze 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.