Themes Seven Ancient Wonders of the World. What would you consider a world wonder? How do we learn about the past? Why do people build statues? Where are artifacts found? What makes something a legend? Red Rhino Books Nonfiction is the first Hi-Lo children's nonfiction series at a first-grade reading level for students in grades 4–7. Visually appealing fullcolor photographs and illustrations—along with fun fact boxes—keep these books flowing. Also includes prereading comprehension questions along with a 20-word glossary for further reading support.