Khalil Najafi and Tzeno Galchev at the University of Michigan have created a new Parametric Frequency Increased Generator (PFIG), which measures only one cubic centimeter and produces an electric charge when stressed. Regular body movements, noise, traffic vibration, and other non-periodic vibrations can create enough electricity to power a wristwatch or a pacemaker. If you wore one of these on a wrist while watching porn and screaming, you could power a city. Okay, maybe not, but you should try it anyway. For science.
With current pacemakers, the patient has to be cut open every ten years or so to have a new battery put in. A PFIG could be a permanent replacement. It can also be used on bridges, harvesting road vibration to power wireless sensors monitoring the stability of the bridge. It can be used in public buildings with a lot of foot traffic vibration to produce supplemental electricity. It can also be hooked to a cat’s collar to power a little gizmo that randomly makes bird calls and shoots a laser pointer at the floor, just out of reach. And that’s the most practical use of all.