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What your smile says about where you’re from

If you come from a country of immigrants, you’re more likely to crack a friendly smile on the street. That’s the conclusion of a new study, which may explain why Americans beam more than their Chinese and Russian counterparts. Scientists have known for decades that societies have their own unwritten rules about when it’s appropriate to smile, frown, or get angry. These rules are part of a country’s “emotion culture,” the norms that influence how and when people express whether they’re pleased or upset. Researchers often study these differences geographically, finding that the United States and the West tend to be more expressive than China and the East. But those geographical studies overlook the important role migration played in shaping emotion culture, says Paula Niedenthal, a psychologist at the University of Wisconsin, Madison.