Richard Skolnik, lecturer for Yale's Essentials of Global Health course, opens the burden of disease unit by surveying where global health stands today. He walks through key demographic factors, including population growth, fertility, and age structure, and explains why these numbers matter for planning health systems. The session then turns to what people actually get sick, disabled, and die from worldwide, introducing the risk factors and determinants behind those outcomes, from income and education to environmental exposure. Skolnik frames these statistics as the foundation for everything else the course will cover, since understanding the current burden of disease is what allows policymakers to prioritize interventions. The lecture is data-driven but plainly explained, aimed at students with no prior background in public health, and sets up the more detailed sessions on specific diseases and conditions that follow later in the course.