-- Interfact combines the lively design of an excellent reference 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 disc contains up to 15 hours of activities, games and on-screen adventures.-- Each disc has seven interactive features with up to 15 hours of playing time -- experiments, quizzes, games, explorations.-- The package is compact, ring-bound for ease of use and conveniently stores the disc in a plastic wallet securely bound to the book.