In 1957, a small group of scientists launched Project Orion, a secret US
Government-sponsored attempt to build an interplanetary spaceship propelled by nuclear bombs. Isabel Hilton talks to
George Dyson , who has written an account of the failed project, and his father, the English mathematician
Freeman Dyson , who was one of the team, about an era when values were "tweaked" because of the Cold War and "all kinds of strange ideas were able to grow."
