When you pull a long face, you put at work more than sixty facial muscles. When you smile, only eighteen. Why get tired? But why exactly should you smile to the world?

Science has proved that the more you smile the more positive reactions others will give you. Could appear to be logic, but it's even more scientific.

Professor Ruth Campbell from University College London believes there is a mirror neuron in the brain that triggers the part responsible for the recognition of faces and causes an instant mirroring reaction. We, simply speaking, copy the facial expressions we see. This is why regular smiling is important even if you don’t feel like it cause smiling influences other people’s attitudes and how they respond to you.

More concretely, smiling during the first seconds of an important meeting produced a positive response on your audience and gives better sales ratios ...

However, a real smile creates small wrinkles around the eyes, the less sincere people smile with their mouth. Genuine smiles are generated by the unconscious brain, which means they are automatic.

And if you're not sure about smiling or not to the world... for your biz life. Do it for yourself and watch this TEDx VIDEO... where Ron Gutman reviews a raft of studies about smiling, and reveals some surprising results. Did you know your smile can be a predictor of how long you'll live? And that a simple smile has a measurable effect on your overall well-being? Prepare to flex a few facial muscles as you learn more about this evolutionarily contagious behavior.