Public health can be considered as a sequence of compound systems. A lot of things that people living in developed nations take for granted, like the control of communicable disease, fresh, drinkable water, low child mortality rates, etc. require a high performance system comprised of several experts, locations and communications to work. A lot of people only focus on public health when that scheme fails. This book explores a number of systems in public health inclusive of aspects of the food system, health care system and rising issues like waste reduction in nanosilver. A number of units deal with international health concerns including non-communicable disease avoidance, poverty and health-longevity medicine.