We were just coming out of a period in which theory was in disgrace. I have described that also in some of my writings. The… during that period, quantum field theory, which seemed to be the tool that one should use for describing elementary particle physics, led to very nice formulae in lowest order plus infinite corrections, and so it was a disgrace. Some people proposed throwing away the higher corrections, but that was absurd. As Barber said, just because something is infinite, doesn't mean it’s zero. The… in that same period of confusion people tried to interpret the muon as Yukawa's meson, and of course the muon's properties were totally different from those of Yukawa's meson. So theory was in disgrace in that department as well. Things were very bad, but just before I arrived at graduate school in MIT, things got cleared up — that very year, the previous year. It was… the Lamb shift was measured, and it took this measurement of an electromagnetic correction, a correction to quantum electrodynamics, to persuade people to calculate it seriously on the assumption that it was finite. Before it was measured, did people suppose it was actually infinite? It was only once it was measured, and they had a number that people were inspired actually to calculate it seriously... and, of course, several theories showed right then that you could get a finite result.