I'm not entirely sure where I read that (although possibly in a book that I have at home), but that was a pretty striking revelation to me, so I'm rather sure that my memory of it is accurate. I agree that it is pretty difficult to accept, and the only explanation I can think of is the lack of sophisticated communication with chimps. So again, we have a chicken/egg thing, is language (in the broadest sense) a product of education, or is education only possible with language? Either way, I think this is the root of hominid evolution. Of course, animals are able to communicate with one another, but just how sophisticated are these methods? What are they actually telling each other?
In any case, it is the only reasonable explanation to me why chimps don't have civilisation: If language is the basis for education, and education is the basis for intellectual development, I think we must assume that chimps either don't have language, or that they don't know how to educate.
Anyway, I'm off for lunch, so I'll log back in later.