My office has south facing windows that allow light to shine in on a big bookshelf that is behind my desk. Some of my books have been sitting on that shelf since June 4, 1990, the day that I moved to Estevan. Last week I grabbed an old college textbook off that shelf and noticed that while the front cover of the book was still the same bright and brilliant red that it was when it was first published, the spine was almost white. In fact, the colour had faded so much that the title was barely visible. Now this change did not come quickly. Had I taken that book off the shelf after a week, you would not have been able to see any difference at all. After a year or two, you may have started to notice some fading. However, after twenty-five years of the sun shining on it almost every day, the change is obvious. ...