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Patrick Maynard Stuart Blackett, Baron Blackett,, was a British experimental physicist known for his work on cloud chambers, cosmic rays, and paleomagnetism, awarded the Nobel Prize in Physics in 1948. In 1925 he became the first person to prove that radioactivity could cause the nuclear transmutation of one chemical element to another. He also made a major contribution in World War II advising on military strategy and developing operational research. His views saw an outlet in third world development and in influencing policy in the Labour government of the 1960s.