One morning last semester, a Duke undergrad peeled off from a busy day on campus to hustle to a basement office in the Sociology- Psychology Building, where scientists were waiting to peer into her brain. Within minutes the slim first-year student, chic in a black-and-white shorts set, was sitting before a computer screen in a narrow, beige room. For more than an hour, her fingers clicked answers to hundreds of questions about her tastes, behaviors, quirks, and feelings.