http://www.depauw.edu/learn/lab/publications/documents/other/Other_Smile%20intensity%20in%20photographs.pdf
http://scholar.google.com/scholar?hl=en&q=smile+intensity+divorce&btnG=Search&as_sdt=0%2C5&as_ylo=&as_vis=0
Baseball players who smile on their playing cards live longer
Multiple studies have shown that how much a person smiles in childhood photographs can predict their future happiness. And now, thanks to baseball playing cards, we know smiling actually makes you live longer.
http://io9.com/5679799/baseball-players-who-smile-on-their-playing-cards-live-longer
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