“You don’t have to have studied the description-experience gap to understand, if you’re truly expert at something, that you need experience to balance out the descriptions. Otherwise, you’re left with the illusion of knowledge—knowledge without substance. You’re an armchair philosopher who thinks that just because she read an article about something she is a sudden expert. (David Dunning, a psychologist at the University of Michigan most famous for being one half of the Dunning-Kruger effect—the more incompetent you are, the less you’re aware of your incompetence—has found that people go quickly from being circumspect beginners, who are perfectly aware of their limitations, to “unconscious incompetents,” people who no longer realize how much they don’t know and instead fancy themselves quite proficient.)”