One of the strengths of a virtual environment is the ability to immerse the occupant into an environment that would otherwise be impossible. The primary focus of the author's project in Second Life is to take advantage of this opportunity to explore novel approaches to medical education. Second Life can be used to model doctor-patient interaction, clinical diagnosis skills, and three dimensional molecular and cellular modeling of objects from individual molecules to whole organ systems, both healthy and diseased. Using the powerful building and scripting tools of the Second Life platform, the author has created a model of the human testis that students can fly through and interact with to understand how the anatomy and physiology of the testis work together to regulate sperm production. The anatomical and physiological interactions occurring during these processes are described in accompanying audio and text. The development of educational tools within the Second Life context is in its infancy. As the technology matures, the opportunities for education within Second Life will continue to expand as an important adjunct to traditional pedagogical approaches.