This series answers intriguing questions on a wide variety of topics including animals, the human body, science, nature, space, history, and more. Each question also features a series of six challenging follow-up questions that help children develop important thinking skills, such as recall, inference, deduction, creative problem solving, flexibility, and elaboration.

Appealing illustrations throughout each book engage young readers and provide additional information and visual clues. Suggested answers to the follow-up questions are included at the back of each book.