Happy International Day of Happiness! Today is the International Day of Happiness and the theme this year is ‘Happier Together’. The focus is on what we have in common, rather than what divides us. Indeed, research has shown that relationships are essential to our happiness and wellbeing. I do not refer only to romantic relationships; our social network includes friends, family, colleagues, neighbors, teammates and so on.     Research has also shown higher mortality among individuals who are lonely. In The Nordic Guide to Living 10 Years Longer: 10 Easy Tips to Live a Healthier, Happier Life Dr Bertil Marklund, a doctor and researcher at the Gothenburg University, shares…