Public health is a part of the health system whose researchers' have tried to maintain its relevance over the years amidst unstable global conditions. Maintaining its tripartite objective of promoting health, preventing diseases and prolonging life is a major hurdle especially as these functions have to depend on the combined efforts of society. This book focuses on principles, perceptions and programs of public health. Some of the topics discussed in this book include school shootings; waste management and public health; and tobacco use.