Human Behavior in the Social Environment (HBSE) is one of the first courses that social work students take. This book incorporates principles and findings from molecular biology, neuroscience, psychological, and sociocultural sciences in a coherent fashion. Filled with numerous pedagogical tools such as case studies, sidebars on Spotlight Topics, and Expert's Corner, this book integrates lifespan issues into each chapter. Its cell to society approach incorporates research from the natural and biological sciences and the social sciences to produce the most comprehensive and scientifically accurate account of empirical phenomena.