(VIDEO) Institute for Bioengineering of Catalonia (IBEC) This video is under embargo. Please login to access this video. Caption Movimiento de los nanorrobots en urea. Credit Instituto de Bioingeniería de Cataluña (IBEC) Usage Restrictions no restriction 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.