Grzegorz Buczkowski, Purdue University (IMAGE) Purdue University Caption Purdue entomologist Grzegorz Buczkowski holds a beaker of dry hydrogel crystals (left) and the same volume of crystals after they have absorbed water (right). Hydrogels saturated with a chemical dissolved in sugar water are attractive baits to Argentine ants. Credit Purdue University/Tom Campbell Usage Restrictions Credit: (Purdue University/Tom Campbell) 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.