A user touches a virtual tennis ball (IMAGE) City University of Hong Kong Caption A user touches a virtual tennis ball in VR via WeTac, a skin-integrated wireless electrotactile system. Credit Dr Yu Xinge’s research group / City University of Hong Kong 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.