Having happy friends can make you happy

If you’re happy and you know it, thank your friends — and their friends. And while you’re at it, their friends’ friends. But if you’re sad, hold the blame. Researchers from Harvard Medical School and the University of California, San Diego, have found that “happiness” is not the result solely of a cloistered journey filled with individually tailored self-help techniques. Happiness is also a collective phenomenon that spreads through social networks like an emotional contagion.

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