Humans can produce thousands of distinct facial expressions – including 19 different types of smile, according to research by the American psychologist Paul Ekman. However, only one of these is ...

This is a sign that the dog is content and relaxed. It is the closest canine equivalent to a human smile. You can see it in virtually all breeds of dogs such as those depicted here. Smiling dogs ...

From his college years playing for Oklahoma to becoming a Super Bowl champ, take a look at Jalen Hurts megawatt smile through the years ...