During the Thanksgiving season several years ago, the leader of a youth group from a prosperous suburb persuaded everyone to help serve meals in an inner-city soup kitchen. Before this volunteer service project, most of these young people had only seen homeless, impoverished locals through their car windows as they and their family drove through a poor part of town. The teenagers served a predictable Thanksgiving menu of beans, mashed potatoes, yams and turkey to a long line of homeless people. As they filed past these young people, filling empty plates with generous servings, few of the homeless people made any eye contact with the teens ...