A warm, friendly, excepting smile can go a long way and is also part of the healing process. A smile is generally an expression of positive emotions, which can uplift a soul, who in turn passes that energy to another.
It is also about body language. It is a means of understanding something unspoken which can be as simple as, a friendly greeting.
The frequency of a smile received can vary and quickly move into your intuitive side the right brain. What does that smile mean? Okay, I got it! Now you react to the smile perhaps returning it with a smile. Laughter is a related healing tool and is also contagious as it is a high frequency emotion.
Why smiles (and frowns) are contagious Science Daily - February 11, 2016
Smile! It makes everyone in the room feel better because they, consciously or unconsciously, are smiling with you. Growing evidence shows that an instinct for facial mimicry allows us to empathize with and even experience other people's feelings. If we can't mirror another person's face, it limits our ability to read and properly react to their expressions.
How Smiling Can Make You Happier (in 30 Milliseconds or Less!) Huffington Post - December 4, 2015
It happens. You're feeling down and need a quick pick-me-up. Or maybe you've found yourself in a silly argument you realize you'd like to get out of. You want to make things better in any little way you can, fast. What can you do? Humans react almost instantly to the facial expressions we see in others. It takes just 30 milliseconds (thousandths of a second) for your brain to recognize and respond to others' emotional expressions, such as smiling or frowning. Research shows that these reactions are unconscious, meaning that they're not even accessible to the conscious part of the brain, but rather are innate, unchangeable biological responses. We naturally mirror the facial expressions of the people we see. So, when you smile at someone, he or she really can't help but smile back at you. (Even if it's more physiological than visible, it's there, according to measurement with some pretty fine-tuned instruments.) Humans react almost instantly to the facial expressions we see in others. It takes just 30 milliseconds (thousandths of a second) for your brain to recognize and respond to others' emotional expressions, such as smiling or frowning.
Researchers measure the value of a smile PhysOrg - May 10, 2011
Researchers at Bangor University have placed an economic value on a smile, demonstrating scientifically the effect that a genuine smile can have on our decision-making. The psychologists call this social information and say that it has more of an effect than you may imagine. The researchers examined people's responses to two types of smiles: genuine and polite. The feature that distinguishes these smiles is the presence of laugh lines, the tiny wrinkles that appear at the corners of the eyes during genuine but not polite smiles. The authors designed an experiment in which students played a game against computerized 'opponents' with either higher or lower chances of winning money and who smiled either genuinely or politely. In the later stages of the 'game', the researchers measured people's preferences by asking them to choose their opponents. The results allowed the researchers to determine how valuable participants found each type of smile.
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