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It no longer entails the use of X-ray then.

Well, these studies didn't. There's a doctor at Harvard called Hellman who has used X-ray very expertly, but he seems to be the only great radiologist that uses X-ray in a way that impresses surgeons or people that use drugs. And when you're the only person, it is too bad because it takes a long time for people to copy you even if you're right.

The most important advance in science to me is the development of gene splicing or recombinant DNA in making different types of interferon. I don't know if I talked about this last year.

You did talk about it a little bit, yes.

It is not only important in medicine -- it's important in agriculture and in energy -- and there will be a whole issue of Scientific American that outlines it in detail, the September issue. And I beg you to get a copy.

I will try.

In fact, I'll try to get an extra copy, but don't wait for me. Just try to find it on a newsstand or order one, because it's so thrilling. It means that we're going to be able to have seeds that will produce corn and whole wheat that don't need (continued on next page)