For pediatric heart surgeon Hisashi Nikaidoh, MD, a chance encounter near the hospital cafeteria would stay in his mind forever. The woman he ran into had lost her son in this hospital years earlier. Now she was working in the very place that had been unable to save her child's life. Dr. Nikaidoh was stunned. He wondered how she could tolerate coming here every day. But respecting her privacy, he never asked the question. After...