Although questionnaires routinely ask people to check boxes indicating if they are, for example, male or female, black or white, Hispanic or American, many people do not fit neatly into one category or another. Identity is increasingly organized multiply and may encompass additional categories beyond those that appear on demographic questionnaires. In addition, identities are often fluid and context-dependent, depending on the external social factors that invite their emergence. Identity is constantly evolving in light of changing environments, but people are often uncomfortably fixed with...