December 2, 1942

December 2, 1942, marks the first controlled nuclear chain reaction, achieved in Chicago by a team led by Enrico Fermi. In the book, the date carries significance beyond the scientific milestone: it also anchors a contrast between the established resources of Chicago and the improvised conditions awaiting the scientists at Los Alamos.

The Experiment

The account identifies the achievement directly: on December 2, 1942, Fermi led a team that conducted the world’s first controlled nuclear chain reaction. It presents the event as a historical landmark in nuclear research, not as a scene described in technical or personal detail.

A Point of Contrast

John Manley had just come from Chicago when he assessed the proposed Los Alamos laboratory. Chicago offered a major university, extensive libraries, and experienced machinists, glass-blowers, engineers, and other technicians; the remote Los Alamos site had none of these resources in place. The timing makes the contrast pointed: the date associated with a major experimental achievement also frames Manley’s doubts about how difficult it would be to build the new laboratory in the New Mexico wilderness.