A Natural History of Laughter

For how long have we been laughing? Are human beings the only one to laugh?
We know that bonobos, chimpanzees and orangutans also enjoy having a good laugh, especially when tickled.
What are the latest discoveries about neuronal and ethological origins of laughter? This 52 mn film is about why and how we laugh, a scientific and behavioral approach about laughter. It sure will make you laugh but not only in the way you expect. (official distributor synopsis)