Learn all about the human body with this interactive trivia book from Jeopardy! host and champion and New York Times bestselling author Ken Jennings! Dive into anatomy with Ken Jennings to become a Junior Genius! Did you know that your hair is as strong as copper wire? Or that if you could spread it out, your small intestine could cover a tennis court? With cool illustrations, fascinating trivia, and fun quizzes to test your knowledge, this Junior Genius Guide will have you on your way to whiz-kid status in no time!