Anatomically, there are at least two types of smiles. One is the ' Duchenne smile,' which is said to be a genuine smile, and the other is the 'non-Duchenne smile,' which tends to be more social.

Not all smiles are created equal, and anatomically speaking, there are at least two distinct kinds: the Duchenne smile, which reflects genuine happiness, and the non-Duchenne smile, which tends to be ...

Not all smiles are created equal, and anatomically speaking, there are at least two distinct kinds: the Duchenne smile, which reflects genuine happiness, and the non-Duchenne smile, which tends to ...

Not all smiles are created equal, and anatomically speaking, there are at least two distinct kinds: the Duchenne smile, which reflects genuine happiness, and the non-Duchenne smile, which tends to be ...

Anatomically speaking, there are at least two distinct kinds: the Duchenne smile, which reflects genuine happiness, and the non-Duchenne smile, which tends to be more social or strategic.

Not all smiles are created equal, and anatomically speaking, there are at least two distinct kinds: the Duchenne smile, which reflects genuine happiness, and the non-Duchenne smile, which tends to ...