Denmark consistently ranks as the world's happiest nation. Why is that? After accounting for known causes of public euphoria, like spiked water supplies and marijuana infernos, researchers from the University of Warwick finally isolated a genetic mutation in the Danish population which grants them an almost superhuman proclivity for joy.
All the pastry probably doesn't hurt anybody's mood, either.
This gene exists in both "short" and "long" versions, with the long version causing happiness by regulating increased re-uptake of the "feel-good" chemical serotonin, and the shorter version causing neuroses and vague dissatisfaction. The Dutch and the Danes are the least likely populations to harbor short-gened individuals (yet strangely, amongst the most likely to wear jean shorts).
Apparently, the trade-off for all that happiness is a nation where everybody looks like your dad at a barbecue.