Stretched Droplet (IMAGE) Purdue University Caption Purdue researchers have figured out a way to calculate surface viscosity just by looking at a stretched droplet as it starts to break. Credit Purdue University images/Brayden Wagoner and Osman Basaran Usage Restrictions None 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.