Explore the fascinating history of immunology in this introductory lecture from a 10-part series. Delve into key milestones such as the invention of the microscope, development of vaccines for smallpox, cholera, and polio, and the discovery of antibodies. Learn about the contributions of pioneers like Benjamin Jesty and Louis Pasteur, and understand the difference between passive and active immunity. Gain insights into the ethical dilemmas surrounding vaccine development and the importance of cell culture. Discover the locations of immune cells in the body and get a glimpse into current immunological research, with a focus on neuroimmunology.