The more science learns, the clearer it is that although we are here, we shouldn't be. Once we begin considering the details of it all, the towering odds against our existence begin to become a bit unsettling. When we come to see the superlatively extreme precariousness of our existence, and begin to understand how by any accounting, we ought not to exist, what are we to think or feel? Our existence seems to be not merely a virtually impossible miracle but the most outrageous miracle conceivable, one that makes previously amazing miracles seem like almost nothing.