Did someone talk with you with an artificial smile？

Every day people say 'hello' to us with a radiant smile.But do you know he is really good to see you or he just simper？British scientists carried a large-scale online experiment so that to distinguish between a smile and a smirk.
People can log www.sciencefestival.co.uk and register with their name and age to participate in it.They would see many smiling pictures and find the fake one.The leader Pro.Weismann hope they can know which part of our expression can send us the information of smile.
In the past,psychologist believe that by checking the movement of the diaphragm and other parts of the body, it will be possible to see if a person is only pretending to laugh while also distinguishing different types of laughter such as derision and cynicism, Kimura said.（ by Japanese professor Yoji Kimura ）。Now they want to know more.