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Hypothesis: people who smile in yearbook photos are not really happy, just concerned with appearances, and thus likely to stay in a joyless marriage for appearance's sake.

I'm only half joking :)



Though they did measure wrinkles around the eyes as well, which is generally a sign of a genuine smile.

http://en.wikipedia.org/wiki/Smile#Duchenne_smile

(Yes, you can fake that as well, but I doubt enough people know about that part to do it.)


Smiling in yearbook photos is probably an indication of conformity.


My wife didn't smile in hers because she had just recently chipped a tooth and had to have her braces put back in. Not sure what that proves.


It proves that they didn't discover a rule, but merely a trend.




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