Gary Urton, professor of Precolumbian studies at Harvard University, an authority on khipu research, told Discovery News: "The fact that an explanation can be constructed for one or even several yupana that conforms to this theory of a base 40 numbering system amongst the Incas is of some modest interest. Always nice to see my boy Gary being quoted. Good guy. I gave a talk on Incan mathematics once. They did some pretty complex stuff, nobody really knows how. I'd have to read more about this theory to form an opinion.
.... system amongst the Incas is of some modest interest. I was struck by the use of the word "modest" it sounds a bit like academic jealously. but will take your word that he is a nice guy.