Sometimes we will showing a fake smile to others due to some reason but if for you ,how you distinguish a fake or genuine smile from others ? In BBC website,there have a psychology test to spot the fake smile,you can try it by yourself.
Log in to BBC website
,selected the level of ‘Overall outlook on life
‘ and ‘Confidence rating of discriminating between fake and real smile
‘.then it will showing you 20 smiling pictures,you need to determine which one is fake or genuine smile.
I got the 11 out of 20 correct ( seen it is average level only ) .It also explaining how to distinguish a fake smile.
Those who interested,please have a try.