A Billion Years of Sex Differences

A Billion Years of Sex Differences provides the most up-to-date, thorough, and balanced account of human sex differences on the market today, explaining how our growing knowledge of human sex differences can help us understand the modern world.

With over two decades of research on sex differences and an international reputation in the field, Professor Stewart-Williams is uniquely positioned to challenge prevailing views in this fraught debate. Unlike approaches that either exaggerate sex differences (what he calls the "Alpha Bias") or deny their existence (the 'Beta Bias'), this work navigates a middle path of 'Gender-Role Individualism' that celebrates both uncoerced differences and those who buck the trends.