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World Book is a multimedia encyclopedia that will tell you about wonders of our world. The 2011 edition is completely up to date with more than 4,000 new and expanded articles from Michael Bloomberg to Alicia Keys, the Lion King, and Haiti earthquake of 2010, as well as gorgeous new photographs, video clips, and illustrations. Start your exploration from the “Waterstream” home screen where you'll see photos and video clips from the World Book Media Collection float by like leaves in a stream while matching music selections from Just Listening play in the background. Click any “leaf” and you are transported to the Media Center where you can learn more. Test your knowledge with the World Book Trivia Challenge and find out what happened the day you were born with This Day in History.