understanding the different smiles can reveal a lot about how you feel about your relationships — including your romantic partner.Based on a 2009 study published in Motivation and Emotion ...

There are different types of smiles. Smiles can be “felt” or “unfelt": Duchenne smiles are considered felt smiles because they are derived from genuine positive emotion. Non-felt smiles are ...

Make us behave in different ways. Sometimes they're easy. Sometimes they're hard. But showing them is all OK. So what emotions can we feel? When we're happy, we might giggle, we have a huge smile ...

However, more recent findings paint the Duchenne smile in a different light ... believe they are not reliable guides to our emotions at all, but tools that we use to manipulate others.