The area of toxicology is reviewed and expanded on through the use of a video which discusses and explains the salient points of toxicology and the work of Paracelsus. The effect on human health of naturally occurring toxins in the environment is presented. The cause and affect of cholera, the work and findings of Dr. Snow in the mid 1800's in London, becoming the "first epidemiologist" was discussed. Asbestos and Mesothelioma is explained as particulate environmental toxin. The use and examination of an incident map is presented as a tool of the epidemiologist.