A long walk will get you where you need to go, and at the same time allow you to burn a few calories. But the rest of the process is just wasted energy that could be harnessed for something else. At least that’s the idea of the electrowetting process, where a liquid that is normally hydrophobic will be forced to move by applying an electric current.
This is now a concept being used in a pair of shoes but in reverse. By walking with special shoes that contain the special substance you could force the mixture over several electrodes and create a current while walking. This energy in turn could be stored on a battery for future use. Currently a team of engineers at the University of Wisconsin are looking into how to actually bring this from concept to an actual product – but in the future you could juice up your mobile phone simply by walking. Think of this as a way of walking and talking!
[Via Ubergizmo: Electrowetting process helps you generate power while you walk]