How to Survive a Nuclear Attack

We’ve seen what North Korea can do, and even though it hasn’t been in the news lately, the experts we consulted say that terrorists are still trying to get dirty bombs into the country. The threat of a nuclear attack on the United States is higher than it’s been since Berlin had a wall down its center. But what would that attack entail? What kind of damage would a nuclear bomb cause, and what, if anything, could we do to get ready for it?