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Human Biology, Ninth Edition, is written specifically with the undergraduate, non-science major in mind. The text contains an abundance of timely and important information about the structure and function of the human body, exploring the world from the cellular level, then the level of tissues and organs. This book also introduces readers to common diseases they are likely to encounter during their lives as well as an abundance of information on ways to prevent disease and live long, healthy lives. The central organizing theme of the book—homeostasis— illustrates the internal balancing act that has evolved over the history of humankind, allowing our bodies to regulate conditions integral to our survival. For our bodies to achieve homeostasis and maintain health, they must regulate their temperature, levels of chemicals in the blood, as well as a host of cellular functions. Homeostasis and health also depend on our bodies’ external environment—the quality of the air we breathe, the water we drink, and the foods we eat. When I began writing this book, many years ago, I had several goals in mind. The first was to educate you about your body and the ways to take good care of it. The more you know about how your body works, the more able you are to make healthy decisions now and in the future. The book is also meant to teach you about scientific literacy—how scientists gather information, analyze it, and come to conclusions about it—which will make you a more informed citizen. When you read about a scientific discovery in the news, you will be able to make better decisions about how reliable the information might be and how it might affect your life. This knowledge will also help you understand difficult and controversial political issues, like stem cell research (why it’s controversial and why many people feel it is important). Finally, this book encourages you to think critically about the human body and health, looking at the body as a system—a collection of organs and molecules working together, influenced by stimuli inside and out.