The square actuator (IMAGE) City University of Hong Kong Caption The square actuator is comparable to the size of a HK 10-cent coin. Both the touch sensing and haptic feedback functions are derived from electromagnetic induction. Credit © Li, D. et al. https://www.science.org/doi/10.1126/sciadv.ade2450 Usage Restrictions Image must be used with appropriate caption and credit. 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.