Power from the body itselfImplants run on batteries that eventually die. Engineers at the University of Massachusetts Amherst grew living human heart tissue around a mesh of tiny generators, and each heartbeat bent the generators enough to produce an electrical pulse, Earth.com reported on October 23. The team's calculation puts the output at more than ten times the energy for the device's size compared with earlier implanted harvesters. None of it has been tried in a body.DesignThe mesh is abo...