Genes may contribute to making some nations happier than others: First study to show link between genetic make-up and perceived national happiness | consumer psychology | Scoop.it
From www.sciencedaily.com - January 18, 2016 10:21 AM

"The citizens of nations that rate themselves happiest display a specific genetic feature: their DNA is more likely to contain a specific allele involved in sensory pleasure and pain reduction, say researchers ..."