"In a hundred-year period, a handful of men and women changed the way we see the world. Many of them are well known--Marx, Freud, Proust, Einstein, Kafka. Others have vanished from collective memory despite their enduring importance in our daily lives. Without Karl Landsteiner, for instance, there would be no blood transfusions or major surgery. Without Paul Ehrlich, no chemotherapy. Without Siegfried Marcus, no motor car. Without Rosalind Franklin,...