Can you spot the difference between a fake smile and a real one?

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According to research most people are very bad at this.

I scored 13/20 on this BBC test.

http://www.bbc.co.uk/science/humanbody/mind/surveys/smiles/

Smiling is so important in making the world go round that people learn how to fake a smile well.  It makes their life easier.

I would never do that!