From "Ask Marilyn"
Q, What is the difference between ignorance and innocence?
A. If you're 2 years old and you overturn your plate of spaghetti onto your head at a fine restaurant, it's innocence. If you're 32 years old, it's ignorance. The reverse is the case for the person who took you there each time.
Q. What characteristics would you look for to evaluate a person's intellectual ability?
A. If a person knows "what" happens, they have average ability; if they know "how" it happens, they have superior ability; if they know "why" it happens, they have exceptional ability.