Reenactment of French scientist Louis Pasteur discovering germ theory. Pasteur writes in a journal on his desk next to a glass of wine. Close up of Pasteur looking through a microscope. He pulls back, thinks, then looks over as the camera tracks to cages holding rabbits and a chicken. Close up of a hypodermic syringe filling with fluid. Pasteur takes his syringe and walks off screen. The screen fades to more modern surgeons and chemists at work. A chemist examines an array of laboratory glassware. Footage of a medieval depiction of an alchemist. A modern chemist boils liquid in a flask.