And since the human mind estimates probability by the ease with which it can recall examples, newsreaders will always perceive that they live in dangerous times. All the more so when billions of smartphones turn a fifth of the world’s population into crime reporters and war correspondents. … The world is not falling apart. The kinds of violence to which most people are vulnerable—homicide, rape, battering, child abuse—have been in steady decline in most of the world. Autocracy is giving way to democracy. Wars between states—by far the most destructive of all conflicts—are all but obsolete. The increase in the number and deadliness of civil wars since 2010 is circumscribed, puny in comparison with the decline that preceded it, and unlikely to escalate. … An evidence-based mindset on the state of the world would bring many benefits. It would calibrate our national and international responses to the magnitude of the dangers that face us. It would limit the influence of terrorists, school shooters, decapitation cinematographers, and other violence impresarios. It might even dispel foreboding and embody, again, the hope of the world.