Professional epidemiologists are often called on to investigate outbreaks and epidemics. This course serves as an introduction to the essentials of investigation, identifying pathogens, figuring out what's going on, reporting, and responding. You'll learn how to ask precise epidemiologic questions and apply epidemiologic tools to uncover the answers. You'll also learn about basic epidemic dynamics and the terrible law that cause them to grow, as well as the reasons why they recede and eventually go away. The course concludes with deep dives into some real outbreaks from Ebola, in West Africa, to the opioid epidemic in the United States.