I like the picture about nuclear blasts. Those that state what to do right when a nuclear blast occurs. There's a map of about 2 blocks and a nuclear blast ocuurs on one street, and you are on another. A "possible escape route" is planned.
Now,
1) If you know a nucleair blast occured, you are
a) dead
b) blind and burned
c) alive and well very far and quite a time after the blast
2) If you are a block away from a nuclear blast, you are vaporized
Do note that a one inch piece of plywood *will* in fact shield you from radiation. Well, alpha and beta radiation, gamma radiation won't even notice it. But it can save you (a few meters of lead is better, but that's not always possible) (and "save you" is relative - you will still probably die).
