u39.
This was originally outlined in J.D. Bernal (1929), The World, the Flesh and the Devil: An Inquiry into the Future of the Three Enemies of the Rational Soul, K. Paul, Trench, Trübner & Co., and elaborated by Freeman J. Dyson in, “The World, the Flesh and the Devil”, the third J.D. Bernal lecture, delivered at Birkbeck College, London, 1972.