Today's vast multinational scientific monoliths bear little resemblance to the modest laboratories of the early nineteenth century. Yet early in the nineteenth century--when heat and electricity were still counted among the elements--changes were already under way that would revolutionize chemistry and physics into the "big science" of the late twentieth century, expanding tiny, makeshift laboratories into bustling research institutes and replacing the scientific amateurs and generalist savants of the early Victorian era with the professional specialists of contemporary physical science.

Mary Jo Nye traces the social and intellectual history of the physical sciences from the early 1800s to the beginning of the Second World War, examining the sweeping transformation of scientific institutions and professions during the period and the groundbreaking experiments that fueled that change, from the earliest investigations of molecular chemistry and field dynamics to the revolutionary breakthroughs of quantum mechanics, relativity theory, and nuclear science.

This is a lively and compact biography of P. M. S. Blackett, one of the most brilliant and controversial physicists of the twentieth century. Nobel laureate, leader of operational research during the Second World War, scientific advisor to the British government, President of the Royal Society, member of the House of Lords, Blackett was also denounced as a Stalinist apologist for opposing American and British development of atomic weapons, subjected to FBI surveillance, and named as a fellow traveler on George Orwell's infamous list.

His service as a British Royal Navy officer in the First World War prepared Blackett to take a scientific advisory role on military matters in the mid-1930s. An international leader in the experimental techniques of the cloud chamber, he was a pioneer in the application of magnetic evidence for the geophysical theory of continental drift. But his strong political stands made him a polarizing influence, and the decisions he made capture the complexity of living a prominent twentieth-century scientific life.