A Wall-Climbing Robot Uses the Zero-Pressure Difference Method to Form Suction (image) American Institute of Physics Share Print E-Mail Caption A wall-climbing robot uses the zero-pressure difference method to form suction. Credit Xin Li and Kaige Shi Usage Restrictions Journalists may use this image only with appropriate credit. Share Print E-Mail 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.