Is there a happiness gene?

One secret to happiness may lie in genes, a new study suggests.  Denmark and other Scandinavian countries regularly top world happiness rankings, and while many factors influence happiness, genetics may play a larger role than previously thought, according to the study authors.  The new research examined the average genetic makeup of people in more than 100 countries, and compared how similar their genes were to people living in Denmark a measurement called genetic distance. They found that the greater a nation’s genetic distance from Denmark, the lower the reported well-being of that nation.