The Economist asks: What made the world's great universities let women in?

Anne McElvoy is joined by Nancy Weiss Malkiel, emeritus professor of history at Princeton and author of "Keep the Damned Women Out", to unearth the roots of the sweeping changes that came to elite universities in Britain and America in the 1960s and 1970s. What made institutions that had resisted the presence of women suddenly embrace coeducation? And how far might they still have to go?