Marwell’s life has much new to tell us, both about Mengele himself and, more significant, about the social and scientific milieu that allowed him to flourish. There is nothing surprising in educated people doing evil, but it is still amazing to see how fully they construct a rationale to let them do it, piling plausible reason on self-justification, until, like Mengele, they are able to look themselves in the mirror every morning with bright-eyed self-congratulation..