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In June 2014, three scientists published an intriguing article in the peer-reviewed journal Proceedings of the National Academy of Sciences. The researchers described two large-scale experiments they’d conducted over the course of a single week, during which they’d exposed people to either largely positive or largely negative emotions. The results confirmed that emotional contagion is real: Our moods are susceptible to being influenced by those around us. The more negative our social bubble is, the more negative our own emotional expressions become, and the converse is true as well.