Second International Conference of the joint German-Swiss Research Group “Nuclear Technopolitics in the Soviet Union” (NucTechPol). January 31 – February 1, 2019. Room 205, Hallerstrasse 6, 3012 BernIntroduction by Julia Richers(Bern) and Fabian Luscher (Bern).Panel II. With Roman Khandozhko, Tübingen, Slava Gerovitch, Cambridge, MA, and Carmen Scheide, Bern.Slava Gerovitch, Cambridge, MA. Explosive Math: Soviet Mathematicians, the Bomb, and the International Community during the Cold War Slava Gerovitch, Cambridge, MA. Asif Siddiqi, New York.