Leaving the EU is no small affair. It probably will have enormous effects on the UK, Europe, and much of the rest of the world. But just what these effects will be is unclear. To have even a rudimentary sense of the pros and cons of Brexit, a person would need to possess tremendous social scientific knowledge. One would need to know about the economics and sociology of trade and immigration, the politics of centralized regulation, and the history of nationalist movements. But there is no reason to think even a tenth of the UK’s population has a basic grasp of the social science needed to evaluate Brexit.