Spores (image) Wyss Institute for Biologically Inspired Engineering at Harvard Share Print E-Mail Caption As Bacilli bacteria dry out and form spores (shown here), they wrinkle, and as they rehydrate, they swell. A team lead by former Wyss Institute resident scholar Ozgar Sahin harnessed these humidity-driven changes to power an actuator and generate electricity. Credit Xi Chen/Columbia University Usage Restrictions Credit: Xi Chen/Columbia University Share Print E-Mail 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.