Laughing is a reaction to a wide range of stimuli from hearing a joke, being tickled, or seeing something funny. Laughter is considered a visual expression of positive emotional states, such as joy, fun, happiness, or relief. On some occasions however, it may express other emotions, such as embarrassment, apology, confusion, or nervousness. Laughter is regulated by the brain, and can help people to clarify their intentions in social interaction and provide an emotional context to conversations. Laughter is contagious; the laughter of one person can provoke laughter from others. Children tend t
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