below are hand-selected links from past work i still find relevant in some way to the present. ymmv. all are links into worldpowersystems.com, the organization of which is sort of like Ed Grothus's Black Hole ("things go in, never come out") but since files take up less and less space (inflation? expanding universe?) the huge piles therein won't fall on me and kill me. but even i can't find anything on it without egrep.