She commandeered the room in the basement of her dorm as soon as she realized she would have to pull an all-nighter in order to prepare for tomorrow’s final exam. Her roommate, Jenna, liked to get to bed early, so she packed up everything she thought she would need and went downstairs to study . . . and study . . . and study some more. It was two o’clock, when she realized that she’d left one of the textbooks upstairs on her bed. With a dramatic sigh, she rose, and climbed the stairs slowly to her third-floor dorm room.