Improving with Harsh Treatment (IMAGE) KTH, Royal Institute of Technology Caption From left to right, foam materials consisting of whey, polyurethane, polystyrene, polyethylene and polystyrene. The top row represents unexposed materials and the bottom row represents the materials exposed to 150 degree air for one month. Credit KTH Royal Institute of Technology 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.