The mechanics of how smiling might make us feel happier aren’t yet known, said the study’s lead author, Nicholas Coles, a research scientist at Stanford University.

Smile, and you can see the measure of happiness shoot up; curl your lip in a sneer and the program notes your disgust. Or, more precisely, your expression of disgust.

For example, smiling should typically make individuals feel happier, ... Pulling a disgusted face, for example, “triggers more intense feelings of disgust,” Thea Gallagher, ...

Robots that can expertly express these kinds of emotions will have a better chance at building human relationships and even persuading humans to do what they want, i.e. taking their medicine on time.

You could say I got "the ick" — a feeling of disgust when someone you're dating does this one thing that you just can't get past. The term was used on Ally McBeal in the 1990s and then ...

The reason for such fastidiousness? It can lower the females’ incidence of disease, from parasitic infections to STDs, scientists say. (Read why humans are hardwired to feel disgust.) ...