Sitting Pretty (IMAGE) DOE/Pacific Northwest National Laboratory Caption This computer model of a zeolite catalyst shows nitric oxide (ball-and-stick) interacting with a positively charged copper ion (copper ball) at an unexpected angle (red dotted lines). Credit Kwak at al 2013/PNNL Usage Restrictions Please credit PNNL/Kwak et al 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.