It is hard to think of another field where there, in a relatively short time, has been such major dead ends with so many senior people going down them. Is there something about-
Is that really true? I don't know, I don't know. What are the other great subjects of the day, for example, the advances in cosmology? I have the impression there that when I listen to, you know, all the television programmes on progress in cosmology- wonderful subject for television because you have all these computer models of the universe- it's- I think you get the feeling that in, let's say the 1980s, there was a view taken about the universe, for example, was it expanding or was it in steady state, and for a time it looked as though the steady state people were absolutely ruling the roost. And then, a few years later, after the principal exponent had died- of the steady state universe, the big bang came in with a big bang and those older theories were discredited. Is that so different from what happened in immunology?