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It had been three years since Nathan had dropped out of his first International Mathematical Olympiad and the world around him was no longer the same. Now, the boy diagnosed as autistic was a math teacher at an elementary school for gifted kids like him. Following in the footsteps of his teacher and friend, Professor Martin Humphreys, was the remarkable young man's way of feeling closer to the man who taught him everything he knew. Six months after a beautiful ceremony that united his mother and his teacher, Martin said goodbye to the family that welcomed him with so much love, leaving Julie, Nathan's mother, a widow once again. The middle-aged woman felt lonely again, even more so now that her son was more confident and independent to see the world alongside a good friend he had met in college. Julie knew that as long as Nathan was by Lizzie's side, her son would be well taken care of, but she would never have imagined that the young biology student would teach her friend the value of many things. Values that mathematics can never calculate.