What is the relationship between criminality and biology? Nineteenth-century phrenologists insisted that criminality was innate, a trait inherent in the offender's brain matter. While they were eventually repudiated as pseudo-scientists and self-deluded charlatans, today the pendulum has swung back. Both criminologists and biologists have begun to speak of a tantalizing but disturbing possibility: that criminality may be inherited as a set of genetic...