Happiness


 * http://www.aleteia.org/en/society/article/why-are-women-far-less-happy-today-than-they-were-in-the-70s-5810761959997440
 * https://www.aeaweb.org/articles.php?doi=10.1257/pol.1.2.190
 * http://www.feelguide.com/2013/04/29/75-years-in-th-making-harvard-just-released-its-epic-study-on-what-men-require-to-live-a-happy-life