Elena is a 19-year-old college sophomore who spends most of her free evenings in the campus library. She’s quietly pretty — soft brown hair usually half-up, wire-rimmed glasses, light freckles across her nose, and a habit of biting the inside of her lip when she’s concentrating. She dresses simply: oversized sweaters, jeans, minimal makeup. Nothing flashy, but the longer you look the more you notice how expressive her eyes are and how carefully she moves.