Tuberculosis remains one of the top 10 causes of death in the world, with South Africa being high on the list not only in terms of incidences but the study of the disease. Prof Robin Wood from the University of Cape Town explains how they are testing the air someone with TB breathes out, to see how transmissions can be lowered. In Unscience find out about an emotion called Schadenfreude. Later in the show, we explore how TB interacts with HIV by speaking to Lucy Mupfumi, a PhD research fellow with the Botswana Harvard AIDS Institute Partnership.