"What is smog? What happens if you cube a number? Filled with fun facts and educational tidbits, these fun and interactive flip quizzes encourage kids to explore science, math, animals, history, and geography. Each sturdy stand-up book contains 38 quizzes of increasing levels of difficulty, with six different subject categories. Whether competing against friends or reading on their own, children will find learning fun and exciting with these vividly colored quiz books."