India, Aug. 2 -- In every classroom, there are toppers and talkers, dreamers and doers. But once in a while, you meet a student whose quiet bravery rearranges your idea of strength. Arjun is sixteen. Tall, thoughtful, academically sound. He could very well be part of the usual race: coding marathons, Olympiads, IIT dreams. But his gaze is turned inward, and then outward, toward pain, healing, and the mind's mysterious workings. He wants to be a psychologist. When he first told me this, I nodded with polite interest. It was only when I heard why that I sat up. Arjun has a twin sister. Anya. And sometime between childhood and adolescence, when most kids are worrying about math homework or cricket scores, Arjun was doing something else. He was...