It's a pity that Shelley has gone on to be such an enemy of superstring theory. I can't understand why he does that… why he has taken that position. He's also helped to spread the entirely wrong idea that superstring theory can never be tested. And of course what one could say is that the real unification that occurs in superstring theory does not occur until you reach very, very, very high energies around the Planck mass or…  and that that energy could not be achieved in laboratories or even in cosmic ray experiments in the centre of mass system, and therefore a direct test of the unified regime will not be possible. But that doesn't mean you can't test the theory. And what's curious is that Shelley participated in this move to discuss unified Yang-Mills theory with a higher group, SU(5) or something bigger that would unify the SU(2) x U(1) of the electro weak interaction and SU(3) of the strong interaction… SU(3) of color of the strong interaction, put them all together. And that theory, if it happens to have a significant degree of truth in it would also take effect only at very, very high energies, maybe 10 to the 15th, or 10 to the 14th, or 10 to the 16th GeV--also beyond the range of possible experiments. So this is a clear case of the person who lives in a wooden house not throwing termites. Why should he do that? I… I just cannot understand his position on this issue.