Let us ask: What is circulating now? It's a general invitation and a conversation stated by the folks at the U.S. National Library of Medicine. For over 175 years, the National Library of Medicine has offered a range of historical collections to interested parties and this site offers up an impressive selection of these materials. First-time visitors should read the "Welcome to Circulating Now" essay by Jeffrey S. Reznick, which provides an introduction to the goals and aims of this initiative. Visitors can scroll down through the right-hand side of the site to check out some of the tags here, topical headings, and the collections, which include Jefferson Makes a Declaration and Franklin and the Nation's First Hospital. The site also includes a place where visitors can sign up to receive email updates when new materials are added.