simulated microrobots (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Simulated microrobots sorting themselves in the vicinity of a confining wall: Microrobots with a larger trajectory radius become trapped against the wall upon which they exert pressure while those with smaller trajectory radii are able to continue to move freely within the enclosed space. Credit ill./©: Frank Siebers Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.