Contemporary researchers have collected evidence that naturalist charles darwin (1872) was correct when he asserted that facial expressions are specific.

Contemporary researchers have collected evidence that naturalist charles darwin (1872) was correct when he asserted that facial expressions are: Species specific.
Species specific means that that characteristic is exist in all species without an exception. Facial expression will always be the same no matter what race or ethnicity you are. There is not one healthy person in this world who laugh when they're physically in pain.