8. Jonas Salk
Jonas Salk changed the world by developing the first effective polio vaccine, offering hope where fear once dominated. Before Salk’s breakthrough, polio paralyzed thousands of children each year, with no reliable prevention. Unlike earlier vaccine efforts, Salk’s approach was safe, effective, and could be produced at scale. The CDC credits his vaccine with nearly eradicating polio worldwide, saving countless lives and setting new standards for public health initiatives. Salk’s legacy endures in every vaccination campaign that follows.
