The article is a reprint of an address delivered by the author to students at Milton Academy in Milton, Massachusetts, in Fall 2012. It addresses the author's belief in the important role of schools in promoting gender equality, the gender gap in educational attainment, and the social construction of gender. The author stresses the importance of paying attention to gender, even when the conversation asks us to risk feeling uncomfortable in front of each other, and even when people are not sure about how to proceed. She states that gender is a health issue, a professional issue, a political issue, a domestic issue, and an international human rights issue, and advises Milton students that it is their issue, and that they build the world they want to live in.