Trivia: It Takes Fewer Muscles to Frown than to Smile

What you know is wrong: it actually takes fewer muscles to frown than to smile.

It takes 12 muscles to smile and 11 muscles to frown. Source: The Straight Dope.

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What constitutes a frown or a smile? Are they talking genuine facial expressions with the eyes and forehead and everything involved? Because if that's the case, I would still think it takes more muscles to frown.
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