As a World History teacher, I am always on the prowl for materials that will both engage my high school students and deepen their understanding of the world and its history. This chart works on both levels. It has color-coded designations of the major empires, at a glance showing contemporaneity for various time periods, and has accessible, brief, and relevant highlights through time. Students of varying levels should appreciate this chart, prodding some to learn more about something found within it and others to contextualize for the big picture. In a word, it's aptly named "useful."