We have a clear commitment, both from our own government and from the scientific community: we don't do biological weapons and we don't do chemical weapons any more. So that's already... that's a done deal, and what Bethe is suggesting is that we do the same for nuclear weapons; simply say we're not ever going to develop new nuclear weapons. I think that's good and I think it's high time we do that. I would certainly be very happy to see that adopted officially. To some extent it is. I mean, Clinton already has... I think even before Clinton, I think, Ford or whoever it was, no, I guess it was Bush... already declared the policy of not making new nuclear weapons, so it is our declared policy and clearly that should be maintained. What Bethe is saying is that every individual scientist should also declare the same policy and I think that's fine. I would do... certainly do it myself. In my whole life, in fact, I never did design a nuclear weapon so in a way it's sort of not applicable to me, but... but I think it would be a good idea. The weapons labs themselves are not in that business any more. They are only interested now in understanding the stockpile as we have it.