The Human Body

The Human Body, by Ken Jennings, is an interactive trivia book that explores how the human body works for middle-grade readers. It includes surprising facts such as hair being as strong as copper wire and the lungs having a surface area as large as a tennis court when spread out. The book presents these facts in a question-and-answer format that tests readers' knowledge while explaining body systems. The reading level is 6.4, placing it in the middle-grade range of grades four through eight.