-- Interfact combines the lively design of an excellent information book with the challenge of an activity-packed CD-Rom to help kids learn all about their favorite subjects.-- Book features detailed facts, photographs, illustrations, glossary, and index.-- Multimedia disk contains up to 15 hours of activities, games, and on-screen adventures.-- Each disk has seven interactive features with up to 15 hours of playing time -- experiments, quizzes, games, explorations.-- The package is compact and ring-bound for ease of use. The book cover is protected with a plastic sleeve to which the disk is attached in a sealed plastic wallet.