Book excerpt: Britannica Illustrated Science Library Series covers today's most popular science topics, from digital TV to microchips to touchscreens and beyond. Perennial subjects in earth science, life science, and physcial science are all explored in detail. Amazing graphics--more than 1,000 per title--combined with concise summaries help students understand complex subjects. Correlated to the science curricuculjm in grades 5-9, each title alson contains a glossary with full definitions for vocabulary help and an index.