Former Singapore president S R Nathan, who is Distinguished Senior Fellow of SMU School of Social Sciences, has dedicated his new book, 50 Stories From My Life, to his wife Urmila Nathan, or Umi, as he fondly calls her. Some 55 years after a wedding, two children and three grandchildren, Mr Nathan glows when talking about his wife in an interview at his office in SMU. Their love story is one chapter in his new 184-page book.