This revised and expanded edition has 13000 encyclopedic entries, with attention paid to current affairs, and international politics, nations of the world, technological innovations and major figures in popular culture, literature and science. There are links from key articles to websites. There is an illustrated identification guide to astronomy, the human body, mammals, birds, butterflies and trees; as well as a 32-page world atlas with index. The chronology and ready reference sections have been revised and updated to include contemporary events and figures and achievements in sports, arts, science and technology.