In this lesson, students use the example of tuberculosis to learn how scientists, the government, and public-interest organizations work together to ensure that the public has equal access to disease-prevention information and support. In Part I, students discuss the role of science in public health and play the role of “Disease Detectives” to learn more about tuberculosis from primary sources. In Part II, students participate in a gallery walk to analyze historic public health posters about disease prevention to learn about the people and groups responsible for fighting tuberculosis. In Part III, student groups apply what they have learned to create their own posters about disease prevention today.