What is the only frozen planet? Today the Foo Fighters is a rock band, but did you know that in World War II American pilots gave the name to mysterious UFOs--floating lights they saw over Germany. In addition to an atmosphere, which three things are needed for life? A) water, heat, and air, b) dirt, heat, and light, or c) water, heat, and light.Find the answers to these questions and more in the Britannica Learning Library-an exciting educational series for children ages 7-10 Each book features articles with engaging photography, artwork and activities. Titles include topics children love, from space, science and nature to countries of the world, myths and legends, and much more.Key features of each Learning Library book: * 28 superbly written articles that capture a child's imagination; * Color photographs and/or specially commissioned illustrations on every page * Fun facts and activities for better retention and enjoyment; * Easy-to-use glossary