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Dunning-Kruger effect 0:33
A 33-second explainer of Dunning-Kruger effect, narrated over the same demo you can try yourself.
Try the interactive Dunning-Kruger effect demo
What this video covers
People with low skill in a domain may overestimate their performance, partly because the knowledge needed to perform well also helps you judge performance. The size and shape of the effect - and how much is measurement or regression artefact - remain debated.
You answered fast and felt sure - the question seemed easy. It seemed easy because you could not see what you were missing: the same gap that produced the wrong answer also hid that it was wrong. Real expertise tends to feel less certain, not more.