Lesson plans for a 3(-4, with options) day investigation of the way scientists discovered germ theory and learned to control some of the worst epidemic diseases. The lesson plan for day 1 introduces epidemic diseases and research with 2 short videos on smallpox and the transmission of cholera and a reading selection on the conquest of yellow fever.Day 2-3: instructions for a webquest: small groups of students each investigate and make a presentation on a specific scientist (starting with two sug