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Why do we laugh?

This is a question that not very many people know the answer to or possibly may not even question as to why humans laugh. Laughing is something that begins at infancy and continues throughout life, however it is something we never really think twice about. So the question is... why do we laugh? Luckily, because of the genius creation of the internet I was able to find the reason at the click of the button. Robert Provine, Ph.D. wrote an article for MSNBC.com titled "A big mystery: Why do we laugh?" which provides answers to all of my questions. The full article can be found at http://www.msnbc.msn.com/id/3077386/. Here are some of the major highlights for the article:

-Laughter occurs unconsciously
-Laughter is triggered by many sensations and thoughts, and that it activates many parts of the body
-Laughter is a message that we send to other people
-Laughter is social and contagious
-The first laughter appears at about 3.5 to 4 months of age
-Contrary to folk wisdom, most laughter is not about humor; it is about relationships between people