Clara softly knocked on the door to Professor Kline's office. "Come in, Clara," he announced. She opened his door and took her seat on the other side of his desk when he invited her to. Smiling, she pulled out her paper and passed it over to him. He looked exceedingly pleased when he first browsed it, and then leaned back in his chair and examined it more carefully. His expression looked less and less impressed as he continued to review her work.

"Please take out your phone." She did so, placing the device on his desk. "Unlock it," he told her. She brought the device to her face and opened...