In this 2005 photo provided by the University of Portsmouth, England, baby orangutan Naru laughs while being tickled, in Sabah, Malaysian Borneo. It took a lot of tickling of chimps and other apes, but scientists say they've traced the origin of laughter well back into humankind's evolutionary past. (AP Photo/University of Portsmouth, Miriam Wessels)
Read the article: Ape study traces evolution of laughter
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