Hannah Arendt wrote that terror is the foundation of totalitarianism. The regimes of Adolf Hitler and Joseph Stalin bound individuals into a single quivering mass through which terror coursed unhindered. Some say money is the root of all evil. I say fear is a more likely bedrock. Fear was an important, primal reaction that helped our ancestors survive – and we are all descended from the same; all races can trace their lineages back to the same primate forebears – in a dangerous world.