But believe us, it has nothing to do with the amount of money that's pouring in

Why Do Americans Smile So Much?

The Atlantic

How immigration and cultural values affect what people do with their faces 

"For a study published last year, researchers compared the official photos of American and Chinese business and government leaders. After coding them according to their levels of "facial muscle movement," they found that American leaders in all contexts were both more likely to smile and showed more "excited" smiles than the Chinese leaders did."

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