Why John Green is obsessed with tuberculosis

Tuberculosis is entirely curable and yet also the deadliest infectious disease in the world. That paradox has fascinated John Green, the popular YouTuber and author of The Fault in Our Stars, ever since he met a boy called Henry at a TB hospital in Sierra Leone. Green's new book, Everything is Tuberculosis, tells Henry’s story and asks why this disease still kills more people every year than homicide, war, and malaria combined.