This is a comprehensive and up-to-date synthesis of the theories, research, and research methods designed to explore how, why, when, and to what extent females and males differ in intellectual abilities. Halpern's lively and highly accessible writing conveys complex ideas and interrelationships among variables in an engrossing and understandable manner. Providing a thought-provoking perspective on a controversial and politically explosive topic, her treatment bridges the gap between the sensationalized, often shoddy "pop literature" and highly technical scientific publications.