Kunming girl - China Yunnan

A smile is a facial expression formed by flexing the muscles near both ends of the mouth. The smile can also be found around the eyes (see 'Duchenne Smiling' below). Among humans, it is an expression denoting pleasure, joy, happiness, or amusement, but can also be an involuntary expression of anxiety, in which case it is known as a grimace. Smiling is something that is understood by everyone despite culture, race, or religion; it is internationally known. Cross-cultural studies have shown that smiling is a means of communicating emotions throughout the world. But there are large differences between different cultures. A smile can also be spontaneous or artificial.

China ⁱ/ˈtʃaɪnə/ (Chinese: 中国/中华; pinyin: Zhōngguó/Zhōnghuá; see also Names of China), officially the People's Republic of China, is the most populous state in the world, with over 1.3 billion citizens. Located in East Asia, the country covers approximately 9.6 million square kilometres (3.7 million square miles). It is the world's second-largest country by land area, and the third- or fourth-largest in total area, depending on the definition of total area.