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Olympic smiles: How to identify athletes' nationalities based on their facial expressions

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Headlined to H4 7/27/12

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At www.slate.com

At least 25 muscles are involved in emotional facial expressions, and each emotion recruits a different combination. Most emotions tend to use 3-5 muscles, on top of which different cultures engage extra muscles as nonverbal accents. Americans and everyone else smile using the zygomaticus major, a muscle that runs from the corners of the lips to the outer edge of the eyes. It and muscles around the eyes contract the cheeks, pull the lips upward, and expose the top teeth. This creates an assertive, Tom Cruise-like smile. The British smile also uses the risorius muscle, which runs below the zygomaticus major, to pull the lower lips sideways, revealing upper and lower teeth. Watching the games, look for the lower teeth on smiling British athletes, an agreeable, big smile on Australians, and on the Americans, an assertive, upper-teeth-only smile that gives off a vague air of dominance

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