The President and Vice President: Sincere Smiles!
"Research on smiles is extensive and fascinating. Sincere smiles, which have a name — the Duchenne smile — are related to health and longevity, among other things. But studies also show that different kinds of smiles convey different messages. Our deep brains instinctively decipher smiles and generally know what they mean. A sincere smile conveys confidence, humor and contagious well-being. An insincere smile is hostile — and creepy.
When Biden and Obama project a Duchenne smile, it is indeed a sunny day. They both are blessed with dazzlers and both obviously have recognized the advantage this gives them in politics. Obama’s legendary likability most likely is linked to his billion-buck grin."