A corrosion resistant electrical connection structure has an electrically conductive cable with a core made from a first electrically conductive material and an insulative outer cover. Broadly, the fill compositions include a quantity of solid components including a polymer binder and a solvent system for the solid components. According to another aspect of the disclosure, one of the five degrees of freedom of a human thumb is replaced in the robotic thumb with a permanent twist in the shape of a phalange. A third peaking factor is developed and is associated with a peak average power threshold for the fuel rods.