“Court rise.” A hush falls in the Supreme Court. Five judges—three lords, two ladies, roughly two centuries of accumulated professional experience—walk in. The question that the country’s highest court and finest legal minds have come to consider, in a two-day hearing that took place on November 26th and 27th, is: what is a woman? Finally, an answer looms for those who wonder what those 34m people in Britain who are not men might be.