Roald Sagdeev has already watched one scientific empire rot from the inside. When Sagdeev began his career, in 1955, science in the Soviet Union was nearing its apex. At the Kurchatov Institute in Moscow, he studied the thermonuclear reactions that occur inside of stars. A few lab tables away, Andrei Sakharov was developing the hydrogen bomb. The Soviet space program would soon astonish the world by lofting the first satellite, and then the first human being, into orbit. Sagdeev can still rememb...