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It is a well-known result.

For instance you can test yourself at http://www.bbc.co.uk/science/humanbody/mind/surveys/smiles/.



17/20 although I thought I had them all. Eyebrows don't move if you're faking. Also the way they returned to stone cold normality after the smile gave it away.


Oh, I remember doing this test eons ago. I fared surprisingly well today, 14/20.


I thought I'd do bad, I'm not sure why: 16/20




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