Many factors conspire to keep us from talking to one another. Certainly, smartphones have made it easier than ever to avoid interacting with the people in our immediate environment. And we might be naturally wary about approaching someone who looks untrustworthy to us, even if we have never met them. We prefer to cooperate with someone who looks similar to someone who we have trusted in the past rather than someone who looks like an untrustworthy former acquaintance.
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