Imagined frame (IMAGE) University of California - San Diego Caption Even barriers drawn in the air with a "magic wand" had the effect of reducing cheating. Credit Courtesy Li Zhao, Hangzhou Normal University. Usage Restrictions Only with coverage of this PNAS paper. 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.