Although much media attention has been focused on the physical and medical effects of a modem nuclear war, very little has appeared concerning the sociopsychological effects of a possible exchange between the superpowers. This article is devoted to speculation concerning the effect of nuclear holocaust on those who survive. To that end, physical and medical effects are summarized, and then projected sociopsychological results for urban and rural residents are covered. The uncertainties are indicated in both cases, and long-term sociopsychological effects are considered.As July 16, 1945, approached, the countdown to the explosion of the first nuclear weapon proceeded near Alamagordo, New Mexico, amid frantic activity. Physicist Robert Krohn remarked, "Now prior to the shot, back in the lab there had been some speculation that it might be possible to explode the atmosphere--in which case the world disappears" (quoted in Else, 1980, p. 16). Fellow scientist Robert Wilson said, "There was building up tremendous, almost hysterical anxiety... Things did not appear to be ready" (quoted in Else, 1980, p. 17). A dispassionate narrator described the scene: Fourteen July, seventeen hundred hours. Gadget complete. Should we have a chaplain here? . . . The betting pool cost a dollar. Edward Teller bet on a blast equal to 45,000 tons of TNT. Oppenheimer bet low, 3,000 tons. I. I. Rabi put his money on twenty kilotons. Young technicians were horrified to overhear Enrico Fermi taking side bets on the possibility of incinerating the State of New Mexico. (Else, 1980, pp. 17-18)