George Dyson is a historian of technology whose interests have included the development (and redevelopment) of the Aleut kayak (Baidarka, 1986), the evolution of digital computing and telecommunications (Darwin Among the Machines, 1997), and a path not taken into space (Project Orion, 2002). Turing’s Cathedral, published in March 2012, is “a creation myth for the digital universe” that illuminates the transition from numbers that mean things to numbers that do things in the aftermath of World War II.