Happiness

"Married, extroverted optimists are happier than single, pessimistic introverts, and Republicans are happier than Democrats... it helps to be religious, sexually active and a college graduate with a short commute to work. The wealthy experience more mirth than the poor..."

It's in Iceland, The Secret to Happiness article in January 19th's Economist. If you exchange "married" with "in a relationship" and stretch the word religious a little bit, this helps explain why I'm such a bundle of joy.