About the Cover: A molecular beam machine (Princeton 1987-2002) with the names of G. Scoles' students and, at the top, a sentence due to R. E. Smalley. An artist view of the molecular beam apparatus called CLOUD II with which Kevin Lehmann, Giacinto Scoles, and their collaborators at Princeton did many IVR, van der Waals oligomer IR photodissociation, and He nanodroplet spectroscopy experiments in the period 1987-2002. The figure is based on a slide prepared by Carlo Callegari when he was a student at Princeton. The names appearing on top of the apparatus are those of all the graduate students who have ever worked in Scoles' laboratory and have been coauthors of at least a paper with him. The sentence at the top was pronounced by R. E. Smalley in a conversation he had with Scoles in Washington, D.C., when they were attending a meeting. In an interview that Robert Curl gave to C&E News in January 1997, he reported a bolder opinion in the same direction of Smalley who, paraphrasing a famous quote by Bill Clinton, is reported to have said, "It is the machine, stupid!" The artwork is due to Paolo Marani of Trieste.