How Much Diversity Do You Want from Me?

I'm from Louisville, Ky., attended Yale University and work as a TIME journalist. Since I haven't met any other person who shares these three characteristics, I suppose I add some diversity to most discussions I'm a part of. But at most colleges and workplaces in America, something else about me would make me add much more diversity. I'm black. And as Justice Sandra Day O'Connor wrote in a landmark Supreme Court opinion last week, borrowing language from a lower court, once a few people like me are sitting in a classroom, "discussion is livelier, more spirited and simply more enlightening and...