The first hoots of laughter from an ancient ancestor of humans rippled across the land at least 10 million years ago, according to a study of giggling primates.
Researchers used recordings of apes and babies being tickled to trace the origins of laughter back to the last common ancestor that humans shared with the modern great apes, which include chimpanzees, gorillas and orangutans.
The finding challenges the view that laughter is a uniquely human trait, suggesting instead that it emerged long before humans split from the evolutionary path that led to our primate cousins, between 10m and 16m years ago.
From http://www.guardian.co.uk/science/2009/jun/04/laughter-primates-apes-evolution-tickling
Laughter brings with it a host of positive effects that operate on both the physical and mental levels. It is also fun, expressive, and a way to release tension. Learn to laugh in the present moment, and you'll find that joy is always there.
http://www.dailyom.com/articles/2005/584.html
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