An Expensive EducationProfessor Susan Lowell has it made. A happily married mother of two in a tenure track job at Harvard, she has just won a Pulitzer Prize for her book lionising Hatashil, an East African freedom fighter. David Ayan is her singular Somali born student. He is trying to become a member of one of Harvard's elite finals clubs. He is trying to understand Jane, his girlfriend from a privileged background. He is trying, sometimes, just to get by in a foreign