So Al Hershey-he was very much interested, at the time, in perfecting technologies. He was very interested in kind of squeezing all the information you could out of a particular technology so that was his focus at the time. And we were all busy working on these different systems. He was wonderful. He would talk to all of us but only if we initiated the conversation. So we would have a result and we would go and talk to him and then he would give us-he would think about it and-often he wouldn't say too much about it at the time, but the next morning we would come into the laboratory and there would be two or three pages of written comments on what we had said, and what might be fun to do or he would sometimes give us whole pages of treatises on how to do labeling, radioactive labeling or how to do-the best way to do centrifugation. So he communicated very well in a written form. And it was nice because you had documentation and I actually made a book, a collection of all of these wonderful things that he had given to us and it's about that thick.