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Re:How the Tough Got Going in Kentucky by arethuza on Friday January 08, 2016 @08:39AM (#10864710)
There are cultural differences around smiling so its possible that they are trying to look serious and studious - assuming that the US attitude to smiling has changed over the years.

https://en.wikipedia.org/wiki/Smile#Cultural_differences

NB On my first visits to the US 20+ years ago I was surprised at how you would get big beaming smiles* from people for no apparent reason... but then again I'm from a notoriously dour part of a dour country.

[*] I of course eventually realised that people were giving me big beaming smiles because they were paid to!.

Re:How the Tough Got Going in Kentucky by WorldMaker on Friday January 08, 2016 @10:48AM (#10865660)
Certainly the US attitude towards smiling has changed with regards to camera technology. I'm too lazy to look up primary referents on the subject right now, but long shutter times encouraged people not to smile to avoid grotesque photos and then as shutter times got faster photographers began to eventually "mandate" smiles to prove that they had better cameras until eventually it was weird in the US not to smile in a planned photo.