Dr. Padgett is the genetics expert who came up with the estimate, which was, to be precise, 15-17 percent. That seems like a pretty good-sized number to me, too, and if there really are that many carriers, I wonder why we don't see more dwarfs. We hear about more than we used to, but still, it doesn't seem to be on that kind of scale. Darrell Goolsbee Fort Worth, TX