Since Thomas Jefferson wrote that “all men are created equal”, we’ve pretty much taken equality as a given. The last couple hundred years of history could be viewed as one prolonged struggle for equality, whether taken from the perspective of colonists, racial, ethnic, or religious minorities, the working classes, women, and so on down the line. But how equal are we, really? And what, precisely, are we equal in? Too often we ignore these questions and resort to Jeffersonian platitudes. Not today.