You are likely to walk out of "On the Basis of Sex" filled with awe for Supreme Court Justice Ruth Bader Ginsburg, for many reasons. While at Harvard Law School, she was capable of astonishing feats: While her husband Marty, a fellow law student, fought cancer, she attended both his classes and hers – typing up both of their papers late at night – while managing their household and coordinating child care for their daughter. As a young attorney, she argued a landmark case on gender discrimination, the story of which forms the bulk of this film. And, at its end, you get a glimpse of the actual RBG herself, looking steely and formidable and as if she just might be able to fly, given the right cape.