“And I couldn’t admit I didn’t know general relativity. I mean, here I had started this whole research program to study gravity and I tell them that I don’t know anything about general relativity. I didn’t . . . so okay, I had a major problem on my hands. And I had to be sort of a day ahead of the students. Now all of us have been caught out that way, but I had just been caught out. I couldn’t say no.
