The detonations roll down the years in a place synonymous with Cold War history - Bikini Atoll. About 3,500 kilometers southeast of Hawaii, in the azure waters of the Marshall Islands, "Operation Crossroads" - the first of a series of US atomic tests between 1946 and 1954 - irradiated much of the tiny Micronesian coral atoll and smashed a target fleet of aging warships anchored in its lagoon. In July 1946, two 23-kiloton atomic bombs, code-named "Able" and "Baker", were deployed to devastating effect. The United States served notice to Josef Stalin's Soviet Union of its resolve to dominate the...