“Why Americans Smile So Much: How immigration and cultural values affect what people do with their faces” by OLGA KHAZAN

While there are some universally recognizable facial expressions, different cultures have different rules for displaying them. This article looks at why Americans smile more than people from other countries.

https://www.theatlantic.com/science/archive/2017/05/why-americans-smile-so-much/524967/

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