Social psychology shows we feel interactions between people who know each other are safer than with strangers, but it is precisely these interactions that are now spreading the coronavirus if done without social distancing. Less likely to see them as contagious we tend to take more risks with them such as sitting close together, sharing food or hugging them, say social psychologists. In "psychological crowds" such as events, gatherings, perception of health risks is lowered when it is actually present.
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