then a row of lips with the skin layer peeled off. This is the first known anatomical drawing of the human smile. Floating above the grotesque grimaces on the top of the page in Figure 2 is a ...

They felt happy. Chipped or missing teeth, fillings, or discolored teeth are unveiled when your lips part to smile -- so some people simply avoid it. If you find yourself wanting to cover up your ...

Tracing which of those nerves are cranial and which are spinal may not have been necessary for painting a smile, but Leonardo needed to know. Anatomical drawings of lips by Leonardo da Vinci. Image ...