John Green Instagram – Join us for the YouTube premiere of Crash Course Lecture: Tuberculosis on Monday 3/25 at 12 noon ET. The story of TB is the story of the deadliest infectious disease of all time. Its impact throughout history has touched every facet of life. In a brand new Crash Course lecture format, host John Green will dive into the history of this curable disease, as well as investigate why so many are still dying from it. #tuberculosis #TB