There is thus no doubt that the Russians have built nuclear reactors for producing plutonium from nonfissionable uranium 238. We cannot, of course, be sure that they have not at the same time also built plants for concentrating uranium 235, but the odds favor the negative. We built uranium separation plants at Oak Ridge, Tennessee, and plutonium plants at Hanford, Washington, during the war because we didn’t know at the time which method would work, and we gambled on the chance that, by building plants for producing fissionable materials by four different methods, at least one of them might work. Had we known at the time that the plutonium plants were practical, it is quite likely that we would not have invested a billion dollars in building the uranium separation plants. Since the Russians have obviously decided on plutonium plants as the simplest and cheapest (three plutonium plants cost us a total of $400,000,000, whereas a single large uranium separation plant cost half a billion), it is hardly likely that they would consider it worth while to invest in the much more costly uranium separation plants. As Senator Johnson said in the same broadcast: “We tried out four different methods of making a bomb and all of them succeeded, but one of these methods was superior to all the others in simplicity and effectiveness, and we told the Russians and we told the world that fact. Of course, they didn’t have to make the experiments that we had to make to find out by elimination which method was the most effective and which the one that they should follow.” The evidence is thus strongly in favor of the assumption that Russia has only plutonium plants as her sole source of A-bomb material, whereas we have both plutonium plants and gigantic uranium plants in full operation. If that is so, then our forcing Russia to embark on an H-bomb program, at a time when her A-bomb program is barely started, will place her under a double handicap in her race to catch up with us in A-bombs, and at least to keep abreast of us, if not ahead, in H-bombs. For in this grim race we have a dual if not a triple advantage: our much superior stockpile, both in numbers and no doubt in quality, and our gigantic plants for concentrating U-235, the production of which would not have to be curtailed at all, since tritium can be made only in plutonium plants. In fact, we are now in the process of construction of two great additions to the uranium plant at Oak Ridge.