(2) Happiness and laughter are the ways to prolong life-from the way of keeping in good health.
(3) When human beings think, God will laugh-from the Bible.
Extended data:
Psychologists now find that laughter is one of the oldest ways for human beings to communicate with others, and before that, laughter was only regarded as the embodiment of human sense of humor. Human laughter is to unite with others or laugh at others, or tease others with laughter. Each of us mastered this skill long before we learned to speak.
Not just for fun. Laughter is an expression. So far, scientific research has always associated laughter with humor. But scientists have found that another aspect of laughter is more important. It has nothing to do with humor. We laugh, but we always underestimate its function. Through laughter, people send messages.
Although many people will hear laughter, only certain recipients can understand the information in laughter. This kind of information is just like encryption, because it is directly aimed at the receiver and does not need his conscious understanding.
Baidu encyclopedia-laugh