求翻译：To get an idea of what is going on, take Christakis's findings on the spread of happiness, which were published last month. His team looked at a network of several thousand friends, relatives, neighbours and work colleagues. They found that happy people tend to be clustered together, not because they naturally orientate towards each other, but because of the way happiness spreads through social contact over time, regardless of people's conscious choice of friends.是什么意思？

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