According to Time magazine, a recent study shows that happiness, like the flu and smoking habits, is contagious. The premise: if you are happy, your friends are more likely to be the same. And, of course, it works in reverse. It’s a logical conclusion, but very interesting, too.
That led to their intriguing finding of just how contagious happiness can be: if a subject’s friend was happy, that subject was 15% more likely to be happy too; if that friend’s friend was happy, the original subject was 10% more likely to be so. Even if the subject’s friend’s friend’s friend–entirely unknown to the subject–was happy, the subject still got a 5.6% boost. The happiness chain also worked in the other direction, radiating from the subject out to her friends.
For cranky people, I guess this means that you should get new friends.
You can read all about it here.