On December 2nd 1942, physicist Enrico Fermi and his colleagues at the University of Chicago successfully obtained the first controlled self-sustaining nuclear chain reaction in a former squash court beneath the athletic fields. Visitors to this fine digital collection created by The University of Chicago Library can learn about this event and Fermi through a selection of materials, including hand-written notes, papers, images, and so on. Visitors may wish to read the biographical essay of Fermi located in the "About Enrico Fermi" area, and then proceed to the "Enrico Fermi Collection" area, which includes digitized copies of his notebooks that address such topics as elementary topics, the famed Chicago cyclotron, and notes for a course on nuclear physics. The site also has a nice selection of images that include photographs of the converted squash court where the chain reaction took place and a sketch of the experiment itself. Finally, the site is rounded out by a copious list of additional online resources related to Fermi and his work.