Dunning-Kruger is that phenomenon whereby the less competence you have in something, the more likely you are to overestimate your ability at it. Contrary to what, I’m sure, most of us would like to believe, it applies universally, to everyone–yes, even me, even you–and is more about cognitive biases than “intelligence” per se.

Steven Novella over at NeuroLogica has a look at what we can learn from Dunning-Kruger, and he also includes a copy of the graph of the effect, which I’d never actually seen before. (Basically, no one likes to think they’re below average, mathematics be damned.)