A Duchenne smile is the type of smile that involves your eyes, too. First identified by 19th century scientist Guillaume Duchenne, this smile is thought to be the most genuine, a smile of true ...

Cats do smile, but not in the way that humans do – while we bare a grin to show our happiness, cats smile with their eyes, says Marci Koski, a feline behavior and training consultant.

A volatility smile is a geographical pattern of implied volatility for a series of options that has the same expiration date. When plotted against strike prices, these implied volatilities can ...

The smile doesn't have to be based on real emotion - faking it works. And while the research details vary, I'd recommend going with a full, true smile that involves your eyes as well as your mouth.

One of the greatest mysteries in art history has been solved: British academics say they have discovered the secret behind the smile of Leonardo da Vinci’s Mona Lisa by studying a recently ...

Our grins are not as simple as they seem. There are a myriad different ways to smile – and some of them can conceal some less than happy feelings.

So Americans smile a lot because our Swedish forefathers wanted to befriend their Italian neighbors, but they couldn’t figure out how to pronounce buongiorno. Seems plausible.

Women hate being told to smile, and it’s only in the past four years or so that I’ve completely lost patience with it. The last time was the grocery store employee who walked by me and told me ...