The never ending struggle for existence inspired Mr Darwin to think in terms of natural selection, which in turn led him to speculate on the concept of the survival of the fittest. Like all great truths, survival of the fittest applies everywhere and to everything. As an example, a smarter police force, actually creates a cleverer type of criminal. And as science discovers more potent germ killers, we suddenly find ourselves trying to cope with stronger, deadlier, and more stubborn strains of germs. And so, on both the social and medical front, humanity is running a grim race for survival.