Korean researchers made a piezoelectric generator that converts kinetic energy into electricity, producing enough from the bending of a small plastic film to light 100 LED bulbs.

Nanogenerators are flexible and lightweight energy harvesters on a plastic substrate that scavenge energy from tiny movements of the human body or light wind and water flow.

A finger bending the nanogenerator produces a measured electric current of ~8.7 μA. The self-powered generator might provide a permanent power source for future implantable biomedical devices.