Gottfried comments I erred in not including an article on Hans Bethe’s work in solid-state physics in the special issue. Physics Today published “A Conversation About Solid-State Physics” by Bethe and N. David Mermin in its June 2004 issue (page 53). And fortunately, an excellent article by Mermin and Neil W. Ashcroft was published recently: “Hans Bethe’s Contributions to Solid-State Physics,” in Hans Bethe and His Physics (World Scientific, 2006, p. 189).