Once upon a time, the idea of a woman serving on the United States Supreme Court seemed strange, perhaps unattainable. Then along came Sandra Day O’Connor, and, a few years later, Ruth Bader Ginsberg. The Court, and the nation, haven’t been the same since.

This week, author Linda Hirshman will tell us all about it. Her new book about the High Court’s first two female Justices and their personal and professional relationships is called Sisters-in-Law: How Sandra Day O’Connor and Ruth Bader Ginsburg Went to the Supreme Court and Changed the World.