Atomic Trajectories (IMAGE) Nanyang Technological University Caption An image of atomic trajectories in a two-dimensional liquid, generated by computer simulations. Most trajectories are elongated, and the elongation of close trajectories is similar. This is the visual signature of the collective motions found by Li et al., which demonstrates a fundamental difference between two-dimensional and three-dimensional liquids. Credit NTU Singapore Usage Restrictions For this story only 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.