Evaporation Energy Harvesting Crystals (IMAGE) Advanced Science Research Center, GC/CUNY Caption Researchers have developed tripeptide crystals (illustrated above), which feature aqueous pores that expand and contract in response to humidity changes and use evaporation to create an effective mechanical actuator. Credit Tony Wang Usage Restrictions For use only with stories on this research 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.