A few facts about laughter Darwin singled laughter an important role in evolutionary development. He believed that laughter helps in restoring mental stability. Freud believed that laughter helps to cope with lustful thoughts. There is a science of laughter. It's called gelatologiya, from the Greek "gelasma" - laughter. The man began to laugh, while still not separated evolution from apes.Researchers believe that it happened somewhere between 2 and 4 million four years ago.Modern baby starts to smile a few days after birth, and to laugh - an average of 12 weeks. Today, people are laughing less than a hundred years ago. Child laughs 20 times more adult. Europeans laugh less than Africans. Women laugh more often than men. From the point of view of biochemistry laughter suppresses cortisol, which adversely affects the immune system. Scientists have learned to raise a laugh and cry artificially. Subthalamic nucleus stimulation evoked tears and anterior cingulate (anterior cingulate) - laughter. True, the patients do not feel the need of emotion. In Paraguay, the Indians guaykis laugh, seeing a man carrying a basket. This is considered a sign of femininity. In the Brazilian tribe nabikvara laugh lovers who kiss in public. Determine the funniest anecdote in the world, is likely to fail. Americans love stories about absurd and flawed. British and Irish - based on a play of words, and in Australia, popular jokes about frightening and stressful events. And the most fun-loving country recognizes surprisingly, Germany. One reason for laughter - a feeling of superiority over those over whom they laugh. This works, for example, jokes about blondes. Plato in his "Republic" recommended fellow citizens less watch comedies because they arouse the lowest instincts. Any doctor can easily explain the appearance of causeless laughter in a human patient. Causeless laughter healthy person could not yet explain.