Read the passage from Sugar Changed the World . The diamond and the house: two family treasures, two parts of the story of sugar. We realized that our two family stories—Marina's great grandparents, brought to Guyana to replace slaves, and Marc's aunt's grandfather, helping to refine an alternative to that same sugar—were just the beginning of a much larger story about a remarkable substance. It is a story of the movement of millions of people, of fortunes made and lost, of brutality and delight—all because of tiny crystals stirred into our coffee, twirled on top of a cake. Sugar, we began to see, changed the world. What is the purpose of this passage?