Readers will adore these interactive journeys into history, nature, and technology. Learners are enticed into focusing on the granular details by searching for up to eight items per spread. Each book also has a smaller hidden object, which students must find by scouring the entire book. A picture-glossary runs across the bottom of each page, which explains different facets of the subject. Readers will be amused by a variety of interesting facts, including how ancient Romans bathed, how the poison dart frog was given its name, and how carpenters make door frames.