some of the buildings, brian, pan up to the one that has a few lights on it. some of the buildings have sporadic lights, probably generators. look over to the left. if you can see the massive black shadow, that is 30 rockefeller center, almost not a light to be scene anywhere. >> the thing that caused all that chaos ten years ago tonight was a tree in ohio. a single overgrown tree branch in ohio. it tripped some circuit breakers in the area. that rerouted the power to a different nearby line that in turn overheated itself and itself shrunk down into another tree tripping another circuit. the world of electricity is interconnected and mysterious, within about a half hour of those two rogue tree limbs touching lines in ohio. power utility operators started to get indications that something was about to be very seriously wrong. within about another half hour, the ohio region was totally blacked out, and that pinch point in the power grid starting with one tree limb and then a