QUOTE : Change often occurs less rapidly than it seems that it should, and the slow evolution of ideas is one of the reasons that societies sometimes change slowly. The Declaration of Independence may have enunciated clearly in 1776 the principle that all men were created equal, but it would be almost two centuries before the United States adopted civil rights legislation that would embrace this principle, and full equality has yet to be achieved. One of the reasons that ideas change slowly is that ideas and perceptions are social constructs. My willingness to hold a belief is related to others’ holding similar beliefs. As I travel around the country and the world, I am often struck how in some places one set of ideas is part of conventional wisdom—such as that government is necessarily inefficient or that government caused the recession or that global warming is a fiction—and in others just the opposite is taken to be the “truth.