KPZ Process in Drying Drops (image) University of Pennsylvania Caption As they aggregated at the edges of a drying drop of water, slightly stretched particles (left) exhibited a Kardar-Parisi-Zhang interfacial growth process, which is common in simulations (right) but rare in nature. Credit Felice Macera, University of Pennsylvania Usage Restrictions With credit. 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.