I was about 50-50 on this fascinating video online science test. Try it yourself. Apparently,
when a smile is genuine, the eye cover fold - the fleshy part of the eye between the eyebrow and the eyelid - moves downwards and the end of the eyebrows dip slightly.
I hope that's not a spoiler.
(Photo: Brendan Smialowski/Getty.)
This article available online at:
http://www.theatlantic.com/daily-dish/archive/2007/06/spot-the-fake-smile/227702/
