Primates, who were our ancestors, used to hunt for their own food in the wild, and often, when they hear a potential enemy from afar, and then suddenly appears in front of them, they leaped at it, showing their "fangs", or rather expose their teeth, just like animals do. And when they realise that their potential enemy is actually a fellow human being, they'll stop leaping. However, they don't have enough time to retract their fangs, and in order to let the other know that they are not hostile, they'll curve their ends of the mouth upwards, to form a smile. This smiling action actually serves as a message to their fellow friend that they are actually friendly, but if their friend proves to be a threat, they'll have no mercy on them. So it's like "hey, i won't hurt you but if you try to do anything funny that's it." And according to mr. brain, it's a declaration of one's intention to terrorize the other.
Basically, it's nothing much good if you see a smile then.
AND that's how a natural smile should look like, when its your frontal cortex (the part of your brain that controls emotions) doing it's work. When you force a smile in front of a camera, it's the part of the brain that controls your motion, the locomotive center, that gives out the required signals to move the muscles.
AND guess what, i think i've proven the theory right myself. ROARSSSSS *shows fangs*
zai hor?! HAHAHAA. check the video out from 2mins onwards! :D
http://www.viikii.net/videos/watch/27564/0/mr-brain-episode-7-part-1.html
read up more about the smile here!
http://answers.yahoo.com/question/index?qid=20070813190007AANiNoU
+ guaishou's! :D
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