May 13, 2005 — -- Maybe that guy at the office who deliberately laughs at the boss's jokes has it right. A carefully cultivated ability to giggle might help you and the people around you feel ...

Laughter is thought to have evolved as a form of social bonding in animals and as a way to express playful intention. Many mammals laugh when they are tickled and when they engage in physical play.

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Portrait of a handsome man laughing while looking at laptop.(Getty Images/iStockphoto/nortonrsx) Everyone likes a good belly laugh from time to time, and science ...