New material harvests energy from water vapor (video)

http://web.mit.edu/newsoffice/2013/new-material-harvests-energy-from-water-vapor-0110.html / Massachusetts Institute of Technology MIT engineers created new polymer film generate electricity ubiquitous source water vapor new material changes shape after absorbing tiny amounts evaporated water repeatedly curl up and down harnessing continuous motion drive robotic limbs generate electricity power microelectronic nanoelectronic micro-electronic nano-electronic devices environmental sensors higher efficiency converting mechanical energy into electricity this material broader applications potential applications include large-scale water-vapor-powered generators or smaller generators to power wearable electronics artificial muscles 3D three dimensional /