Is a smile real or fake?
From CNN | November 15, 2007
CNN’s Dr. Sanjay Gupta reports that psychologists can tell how happy you are by reading your smile.
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http://www.cnn.com/video/portable/promoplayer.html?mode=vod&video=/video/health/2006/11/15/gupta.yearbook.smiles.cnn&source=pop/