We have become oddly familiar with the possibility of a hurricane or other natural event that can, for a short period of time, knock out power to an area and leave us without electricity for several days to a week or more. But what only a few have thought about (at least until recently), is how vulnerable our power grid is to sabotage in the form of cyber-attacks or even physical attacks that can knock out electricity for extended periods of time. The recent cyber-attacks on our oil pipeline and...