This book peels away the 'veneer of certainty' which many of us attach to health risk and benefit information given to us in our daily lives. It was written and designed primarily to assist the public in comprehending and interpreting the uncertainty associated with the overwhelming amount of information on medical and environmental health risks. The book uses unique, visual presentations and case studies to explain the benefits of medical screening tests (e.g., mammography, prostate and colorectal cancer screening, cholesterol screening) and drugs (e.g., statins, Vioxx) and the risks associated with exposure to environmental contaminants (e.g., lead, dioxin, radon). This book will help patients and their families get more involved in making medical decisions, and citizens face critical questions about the environment. By putting the complexities of risk analysis in terms the general public can relate to, the authors are empowering people to make well-informed decisions.