Winner: Parents' Choice "Doing and Learning" Award For those who find the human body to be a fascinating biological machine, look no further! Embark on a voyage of discovery through the human body, based on the classic work by Henry Gray. Children and adults will enjoy learning about the various systems of the body and their particular functions. Then they can get creative, coloring in the detailed illustrations of those systems. With more than 85 illustrations to color, it's easy to understand what goes on inside you!