Ms. Hansen and the Explorers are very interested in learning--they want to know everything they can about the human body. But they aren't alone! The Zelmans, Xeni and Zeno, have come from their planet to learn about Earth's beings too! They travel into the liver's lobes to learn how the liver works to help digestion and filter out poisons from the blood. Come along as the Explorers and their favorite guests tour the human liver.