The stupidity of wisdom (and vice versa)

My father used to tell me that there is no such thing as a stupid question.

The army, I subsequently discovered, preaches the same truism. Or at least they did until, recently, a fellow recruit asked how one is supposed to distinguish between a nuclear explosion and a regular one.

To those who still set their store by the wisdom of dumb questions, I prescribe this.



[Thanks to JB]