Everything You Wanted to Know About Sex Differences, but Were Afraid to Be Perceived as Politically Incorrect: Brain Gender, by M. Hines. 2004. New York: Oxford University Press. 307 pp., $49.50.

Hines finds it impossible to make distinctions between the terms “sex” and “gender,” hence their refreshing, non-political interchangeability in her new book. After examining hormonal and brain-based data, Hines concludes that science cannot yet inform us which differences are determined biologically, socially, and/or both.