Lawrence Summers, president of Harvard, offended some women at an academic conference by suggesting that innate differences in sex may explain why fewer women succeed in science and math careers. Nancy Hopkins, a MIT biology professor, walked out midway through Dr. Summer's remarks. "When he started talking about innate differences in aptitude between men and women, I just couldn't breathe because this kind of bias makes me physically ill," said Hopkins. "Let's not forget that people used to say that women couldn't drive an automobile." Summers said he was simply trying to examine other hypotheses besides discrimination for the under representation of women.