All at once, as it seemed, something we could have only imagined was upon us - and we could still only imagine it. This is what fascinates me most in existence: the peculiar necessity of imagining what is, in fact, real.

In 1994, the Rwandan government orchestrated a campaign of extermination, in which everyone in the Hutu majority was called upon to murder everyone in the Tutsi minority. Close to a million people were slaughtered in a hundred days, and the rest of the world did nothing to stop it. A year later, Philip Gourevitch went to Rwanda to investigate the most unambiguous genocide since Hitler's war against the Jews.