When the START 2 treaty has been implemented - and remember it has not yet been ratified - we will be left with some 15,000 nuclear warheads, active and in reserve. Fifteen thousand weapons with an average yield of 20 Hiroshima bombs.

Józef's early years were spent in what was a prosperous household but circumstances changed at the outbreak of World War I. He was knighted a KCMG in 1998. He was the only physicist to leave the Manhattan Project on the grounds of conscience though others later refused to work on atomic bombs after the defeat of Japan.

Sir Joseph RotblatKCMG CBE FRS (4 November 1908 – 31 August 2005) born Józef Rotblat was a Polish-born British-naturalised physicist. A signatory of the Russell–Einstein Manifesto he was secretary general of the Pugwash Conferences on Science and World Affairs from its founding until 1973. His work on nuclear fallout was a major contribution to the agreement of the Partial Test Ban Treaty.