Your facial expressions are one of the most obvious ways to communicate how you feel to others. Your smile, in particular, is a double-edged sword, conveying both underlying and surface-level ...

Humans can produce thousands of distinct facial expressions – including 19 different types of smile, according to research by the American psychologist Paul Ekman. However, only one of these is ...

Related: 10 Big Benefits of Smiling Duchenne smiles are named after 19th century anatomist Guillaume Duchenne, who studied facial expressions. Duchenne smiles are a particular type of smile ...