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 ...

New research led by Aston University's Dr. Carl Senior has found that the type of smile used by ... There are many different types of smile, and the researchers, including Professor Patrick ...

published in Nature Human Behaviour in 2022 that looked at more than 3,800 participants from 19 countries. For the study, the ...