Smack! Smack! Smack! Hearing this coming from your baby’s mouth can be a little disconcerting. As a parent or caregiver, you expect your little one to smack their hand on the table or bang their toys, ...

Two recent studies based at Princeton University suggest that the oral-facial component of human speech evolved from lip smacking, a friendly back-and-forth gesture performed by primates. The studies ...

The lip-smacking vocalizations gelada monkeys make are surprisingly similar to human speech, a new study finds. Many non-human primates demonstrate lip-smacking behavior, but geladas are the only ones ...