"Bruno Moroni"  wrote in
news:bpatme$18kj$1
{at}darwin.ediacara.org:

> Hi,
> 
> Is there a theory / research / material on laugh evolution?
> 
> Thank you in advance.
> 
> Bruno


IIRC,Stephen Pinker discusses the subject in "How the Mind Works", with 
references for further reading.

Yours,

Bill Morse
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