I was also quite active for a considerable number of years in national activities. I served for many years on the review panels of the National Science Foundation. Then I served… I was a member of Paul Weiss's Biology Council. That was a division of the National Research Council. We met about once a month and that was a… even though it took time and meant having to travel down to Washington, at the same time this was a group of outstanding representatives of the different areas of biology discussing all sorts of biological problems, including also administrative biological problems. And we always had very stimulating and quite often very delightful conversations. So these Biology Council meetings down in Washington were important because also these were… practically all of them were leaders in their particular respective fields and so I… I learnt to… to know quite a few of the outstanding people in fields outside my own specialties in the field of biology.