I'm not sure you even want this. Several studies have shown that it correlates with people being depressed about their lifes. Eg http://journals.plos.org/ploson

I'm not sure you even want this. Several studies have shown that it correlates with people being depressed about their lifes. Eg http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0069841 http://journals.plos.org/plosone/article?id=10.1371/journal.... Of course correlation is not causality, but one should still be careful