Discussion of numbers can blunt our sense of the horrific personal character of each killing and the irreducible tragedy of each death. As anyone who has lost a loved one knows, the difference between zero and one is an infinity. Though we have a harder time grasping this, the same is true for the difference between, say, 780,862 and 780,863—which happens to be the best estimate of the number of people murdered at Treblinka. Large numbers matter because they are an accumulation of small numbers: that is, precious individual lives. Today, after two decades of access to Eastern European archives, and thanks to the work of German, Russian, Israeli, and other scholars, we can resolve the question of numbers. The total number of noncombatants killed by the Germans—about 11 million—is roughly what we had thought. The total number of civilians killed by the Soviets, however, is considerably less than we had believed. We know now that the Germans killed more people than the Soviets did. That said, the issue of quality is more complex than was once thought. Mass murder in the Soviet Union sometimes involved motivations, especially national and ethnic ones, that can be disconcertingly close to Nazi motivations.