His comments about the slowing pace of scientific advancement really struck me. I have felt the same thing, often. That in 1922, we were actually somewhat close to the end of discovering all the really interesting things about physics: that is, those things which really shook up our understanding of the universe, but were still somehow comprehensible to our little human brains. I'm beginning to think that it wasn't just overenthusiasm that led me to be pretty disappointed when I went to get a PhD in science - it's that I grew up reading about the results of the most interesting period, scientifically, that man has ever had, which is now over.