"Happiness" is a right enshrined in the Declaration of Independence. Is it a better measure of human "progress" than "Gross National Product?" The king of the Himalayan kingdom of Bhutan proposed the idea 40 years ago, and last week, his grandson -- the current king -- led a UN conference on "Happiness and Well-Being." Canada, France and Britain are among the countries agreeing that measuring economics is not enough. But how can "happiness" be measured? Can it be achieved through government policy? Does Bhutan itself offer a good example? What about the United States?