Audisee® eBooks with Audio combine professional narration and sentence highlighting for an engaging read aloud experience! From earwax and bad breath to boogers and burps, the human body is a disgusting place. Learn about your body's sticky, smelly functions that help you stay healthy. Take a tour of the ugly, smelly, and nasty with the World’s Grossest series—part of the UpDog Books™ collection. You’ll learn the world’s most revolting facts about history, animals, human bodies, and more. Check out each book’s disgusting diagram and compare icky topics to decide which is grosser.