In 1989, feminist Arlie Russell Hochschild argued that working women go home to work a “second shift,” performing the majority of the labor involved in caring for their homes and children. That’s not the only extra shift working women are doing. Some are also being asked to do a second, unpaid shift at work, where they’re putting in extra time to help boost the careers of other women. This kind of labor — such as mentoring or serving on committees designed to improve corporate policies toward women — is essential to helping women advance, which ultimately redounds to the benefit