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New research has given credence to the idea that laughter evolved in a common ancestor of the great apes and humans.

2009-06-04

 ape laughter evolution
The giggling sounds of a hyena contain important information about the animal's status, say scientists. In the first study to decipher the hyena's so-called "laugh", they have shown that the pitch of the giggle reveals a hyena's age. What is more, variations in the frequency of notes used when a hyena makes a noise convey information about the animal's social rank...

2010-03-30

 animal communication speech hyena giggle laughter
Two women are planning to set up laughter clubs in Zimbabwe, one of the world's most challenging economies...

2010-05-04

 laughter Zimbabwe therapy