The cutest of all? When we offer up a big, goofy grin, she matches us with a smile of her own. But are our dogs really "smiling" the way humans do? We asked a veterinarian about what our canine ...

Harrison Ford and Gene Simmons have something to smile about: the legendary actor and the Kiss rocker will both be honored by Operation Smile at the global nonprofit’s annual gala on June 3.

You’ve probably heard the claim that it takes more muscles to frown than to smile. It’s usually framed as a feel-good reason to turn your frown upside down – less effort, more joy.

An apparent viral marketing stunt for 'Smile 2' featured two people wearing demonic-looking smiles on their faces at an MLB playoff game on Oct. 14 MLBONFOX/X There's no escaping the creepy smiles ...

If humanoid robots make you a bit queasy — would it help if they had fleshy faces that can smile at you? The uncanny feat is the result of new technology using engineered living skin tissue and ...

NPR's Ayesha Rascoe speaks to Sebastian Korb, a senior lecturer in psychology at the University of Essex, about a new study showing that even forcing a smile can improve a person's mood.