Everybody everywhere smiles. Across all cultures, people smile. In fact, smiling may be an evolutionary throwback to the silent bared-teeth display of nonhuman primates. Although babies start smiling ...

Smiles are often classified as "real," which are automatic and elicited by positive emotions, and "fake," which are formed purposefully, usually as a polite gesture. Though these types of smiles are ...

"There are hundreds of languages in the world, but a smile speaks them all." It's true too—next time you are lost in a foreign country, just flash a smile and the locals will be happy to help you find ...

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. But anatomically, ...