If each of us dedicates genuine smiles to the destiny of the lonely people, the pitiful handicapped people, the lonely old people, we would have extended a kind hand to save them through their life. Smile is a lifeline for many people in life's waves.
Smiles are not always beautiful, either. It is when the smile does not mean the real meaning of the smile, when it is the smile of pain, despair of those who use the smile to cover their weaknesses or completely lose faith in life. . This is a very pitiful aspect of the nature of laughter, sometimes being used by bad guys to mock others, laugh at the suffering of others. This is a very blameful thing.
The smile is simple, but it is the root cause of life. So in life, you should give a friendly smile as a joy, hope for others and be aware of, laugh in any circumstances, and nuance of expressions accordingly.
Smile for the world more peace.
Smile at everyone and everyone will smile back at you.

One writer once said: "Humans are the only animals that can laugh." According to statistical science, each day, the average adult laughs 6 minutes, each laugh lasts 6 seconds. The average young class laughs 400 times a day. Laughter is tonic. Because when smiling, the human breathing rate is up to 100 kilometres per hour, faces are relaxed and the brain releases a substance that makes people feel refreshed and satisfied. Conversely, when people are in a state or shape, the body releases a substance that softens blood vessels. In some countries, we have used laughter to treat patients. The purpose of this job is to shorten healing time and save money for the state. Therefore, it can be said: whoever has a sense of humour, that person will definitely live longer.