Identity and Violence: The Illusion of Destiny, Amartya Sen (New York: W. W. Norton, 2006), 224 pp., $24.95 cloth, $15.95 paper. - Cosmopolitanism: Ethics in a World of Strangers, Kwame Anthony Appiah (New York: W. W. Norton, 2006), 256 pp., $23.95 cloth, $15.95 paper.