Smooching feels good, of course, but couples first started swapping saliva as a way to test out genetic compatibility.
Lips are made of very sensitive tissue and, because we use our mouths constantly, are over-exposed to harsh environmental factors.
Some researchers are now considering the hypothesis that human speech evolved not from primate sounds but more from monkey facial gestures.
What does it mean to be "thick skinned"? Why is some skin thicker than other skin?
Today, on A Moment of Science, why lips go dry. Let’s start by reviewing the ways in which the surface of our lips is different from the surface of the skin on the rest of our bodies. Basically, our lips are made of the same mucus membrane that coats the inside of our mouths. This […]