Public health is in the news every day, from schools closing due to hand, foot and mouth disease to the banning of trans-fats in an entire city. But what is public health? Whereas doctors treat individual patients, public health is about the health of a whole population. Despite its importance, public health seems obscure and mysterious. This module uses a population-based perspective to understand the broad forces behind development of disease and ill-health. Employing the evidence-based framework, expert lecturers will share experiences, discuss current issues and debate ethical dilemmas from cancer to pandemics, from AIDS to diabetes, from diet to disasters.