Soft circuit (IMAGE) Virginia Tech Caption This soft circuit has two different layers, a top layer with nine LEDs and a bottom layer with nine sensors connected together with 21 liquid metal connections across the layers. The total thickness is similar to a few sheets of paper. Credit Photo courtesy of Michael Bartlett. Usage Restrictions Must credit License Original 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.