pages; $30. Weidenfeld & Nicholson; £25. GEOFFREY WEST is the restless sort. He has spent much of his career as a theoretical physicist, working at the Los Alamos National Laboratory in New Mexico. After a while he became fascinated by biology, then cities and companies. He is interested in all sorts of things, from Isambard Kin

tle doubt that the country has the means to produce between three and six nuclear bombs annually. In 2011, North Korea invited a former director of the Los Alamos National Laboratory, Siegfried Hecker, to inspect a state-of-the-art uranium-enrichment plant at Yongbyon, with just such a capability. According to a Feb. 13 report by