Who knows?

The world is divided into 2 groups. There are those who know, and those who don't know.

Those who know are no problem.

Those who don't know are also divided into 2 groups:

Group 1 is those who don't know and know that they don't know

Well, they can learn!.

But then, there are those who don't know, and don't know that they don't know.

And they become unit managers!