Here's Why Smiling with your eyes — commonly referred to as the Duchenne smile after 19th-century scientist Guillaume Duchenne — is considered the most authentic type of smile associated with ...

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 ...

There are many different types of smile, and the researchers, including Professor Patrick Stewart from the University of Arkansas, Professor Erik Bucy from Texas Tech University and Professor Nick ...