It begins with: "People keep asking if I'm friendly ... has gone viral for showcasing his unique smile. File photos of a Dalmatian walking with its mouth closed and open. One of the same breed ...

In the pen-in-mouth group, the smilers weren’t ... smilers were significantly happier when surveyed afterward. “People have long said to smile even if you don’t feel it, and it’s very ...

Enter Keiko Kawano, smile instructor ... would be significantly loosened. “People started realizing that they hadn’t used their cheek or mouth muscles very much,” Ms. Kawano said, speaking ...

Her facial workouts involve contorting the mouth and cheeks into different ... when Japan has a “long tradition not to smile,” he said. Kawano says that more people in Japan are “catching ...

In a new study, researchers sought a more definitive answer by using electrical muscle stimulation to literally force people to curl the corners of their mouth up or down into a smile or a frown.

Dolphins living in captivity often make an open-mouth facial expression while playing with each other. Zoomarine, Italy Bottlenose dolphins “smile” at each other while playing, making open ...

Dolphins are known for what appear to be big, contagious smiles. But do they actually, well, smile? The answer, according to a new study of dolphin play, is a resounding “maybe.” Dolphins use ...