Los Angeles Times: "Knowing someone who is happy makes you 15.3% more likely to be happy yourself, the study found. A happy friend of a friend increases your odds of happiness by 9.8%, and even your neighbor???s sister???s friend can give you a 5.6% boost.???Your emotional state depends not just on actions and choices that you make, but also on actions and choices of other people, many of which you don???t even know,???"