MAIN IMAGE NEWrobot-1

This tiny transformer begins as a flat square that weighs just a third of a gram and looks like a piece of foil – it can walk, swim, and even dissolve itself. Credit@Evan Ackerman/IEEE Spectrum

This tiny transformer begins as a flat square that weighs just a third of a gram and looks like a piece of foil – it can walk, swim, and even dissolve itself. Credit@Evan Ackerman/IEEE Spectrum