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My fondest Tesla coil memories began as wee tod playing Command & Conquer: Red Alert. I would build chains of these things to fry every oncoming Russian infantry unit. Here's a handy step-by-step guide to building your own Tesla coil that can shoot lightning. Big forewarning (for the kiddies): Tesla coils shoot lightning that can possibly harm yourself or others, so be careful.

Tesla Guide [deepfriedneon]