If you have children, or have ever been around a young child, you know that one of their favorite questions is "Why?" As their little minds are growing, they are curious about everything. They want to know why the sky is blue, why you're doing that thing you're doing, why the dog three doors down is barking, why we are going this way to the store instead of that way...and when they get one answer, they ask "why?" to your response.
As we get older, many of us begin asking fewer of these questions. Things are the way they are, and many of us don't take the time to dig further into it.