It’s said that an Electromagnetic Pulse (EMP) bomb set off at the correct magnitude and altitude could “fry” the unprotected US power grid and send America back to the 18th Century. This means no electricity, emergency services, food production or delivery, water pumping or delivery, and failure of just about anything else that depends upon electricity, motors, or computers. Millions and millions of people would flat out die within days or weeks: of starvation, dehydration, fever, sickness, riots, and worse. And there are those critics—some seemingly madcap—who poo-poo the idea entirely, saying it can’t be accomplished by either Iran or...