Keira Knightley; Christy Turlington; Rula Jebreal; Zhang Xin

Keira Knightley on suffering from stage fright and her recent roles on stage and screen. Rula Jebreal describes her remarkable life story growing up as an orphan in Jerusalem during the First Intifada and recounts how she fell in love with the director who adapted her autobiographical novel into film. Christy Turlington on the vulnerability of pregnant women around the world, which she documents in her new film "No Woman, No Cry." Real estate developer Zhang Xin, C.E.O. of Soho China, looks back at the path that led her to success and the opportunities she has had.