Good for life

Zinc oxide, that super-white mineral, is usually found on the faces of cricketers and surfers, protecting them from sunburn. It turns out that you can cook it in various brews and it produces nanowires that could create a very virtuous circle, if you own a pacemaker.
Scientists at the Georgia Institue of Technology have used the nanowires to build nanogenerators that could power personal electronic devices using the energy generated by heartbeats. Five coupled nanogenerators will produce three volts and 300 nanoamps. Adding more could add up to enough power to drive a pacemaker or at least charge the battery that drives the pacemaker.
Downtime has a nifty slogan for the device: “Good for life”, alternatively, “Lifetime guarantee.”