Impressionistic Water Simulation (image) DOE/Lawrence Berkeley National Laboratory Caption Dynamic computer simulations of molecular systems depend on finite time steps, but these introduce apparent extra work that pushes the molecules around. Using models of water molecules in a box, researchers have learned to separate this "shadow work" from the protocol work explicitly modeled in the simulations. Credit Lawrence Berkeley National Laboratory Usage Restrictions With credit as follows 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.