You have 20 seconds or less to impress upon an employer whether or not she should consider hiring you. From the moment you walk into her office to the moment you sit down in a chair, thousands of neurons will be firing in the interviewer’s brain asking one of two things: “Is this person friend or foe?” It’s an inescapable reflex, necessary to our survival as a species, to gauge immediately whether the stranger before us is going to help us or hurt us.