Why the ignorant are blissful

Inept individuals ooze confidence, study finds
by Erica Goode, New York Times

There are many incompetent people in the world. Dr. David Dunning is haunted by the fear he might be one of them.
Dunning, a professor of psychology at Cornell, worries about this because, according to his research, most incompetent people do not know they are incompetent.
On the contrary. People who do things badly, Dunning has found in studies conducted with a graduate student, Justin Kruger, are usually supremely confident of their abilities -- more confident, in fact, than people who do things well.

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