Word that Lawrence Livermore National Laboratory will install a battery of machine guns capable of spitting out 66 rounds a second with a range of nearly a mile was met by relief by some who think the weapons will deter terrorists but fear by others who worry they'll be caught in the line of fire. The guns, which the lab unveiled to much ado Thursday but has not yet installed, are meant to protect the laboratory's cache of radioactive plutonium, which terrorists might try to steal or destroy, sending a plume over much of the Livermore Valley. The weapons, called...