Che Guevara is a legend. The son of Argentine intellectuals, he became first a physician, then a brilliant tactician who helped lead the revolution in Cuba, then an enduring, almost mythical icon of revolutionary struggles all over the world. Though he was killed more than 30 years ago, his name and image remain uniquely compelling and mysterious. What makes him so fascinating? What actions and accomplishments set him apart from his contemporaries and continue to capture our imagination to...