Are you curious about how the human body works? If so, the Build-A-Body site may pique your interest in the world of the body's organ systems. The site features a drag and drop game where players are tasked with assembling an organ system and making their way through the nervous, skeletal, excretory, and reproductive systems. The site also contains a set of case studies about the various conditions that each system may encounter over the lifespan. The site is a fine tool for teaching basic concepts of human physiology and anatomy.