Why three prongs?
Even already knowing the gist of things, I enjoyed the description of the path-dependent incremental evolution here.<p>But, this sentence makes me wonder about something: "Also, the clear-weather sky current can no longer build up a high voltage, if any excess charge immediately leaks into the earth."<p>Have our region- and even continent-wide grounded electrical networks changed the expression of lightning storms, such that non-electrified areas are noticeably different?