Capillary Action in Coated Tubes (IMAGE) Georgia Institute of Technology Caption This close-up image shows water from a droplet moving into a narrow glass tube that has been coated on the inside with a hydrogel material. Credit Credit: John Toon, Georgia Tech 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.