If the scientists are more confident today than they were in 1940, and even, it would seem, in 1945, when the bomb stood on its steel tower ready for its first test, it can only mean that their confidence is based on innumerable experiments carried out during the five years that have elapsed since Hiroshima. By the semiannual reports to Congress by the Atomic Energy Commission, and reports presented before the American Physical Society, or published in official publications, by members of the Los Alamos Scientific Laboratory and other leading institutions, we have been officially informed of many experiments that have been carried out on nuclear reactions between deuterons and deuterons, tritons and tritons, and deuterons and tritons—namely, the very reactions to be expected in an H-bomb using deuterium, tritium, or a mixture of the two. This makes it obvious that during the five years since Hiroshima we have accumulated a vast body of knowledge about the reactions necessary for a successful H-bomb. Furthermore, this gives us the assurance that we are five years ahead of Russia on the H-bomb as well as the A-bomb, since we have had plutonium plants in which to make tritium for at least five years, whereas she has just placed her plutonium plants in operation and, as we have seen, can ill afford to sacrifice the vital plutonium she needs for building up her A-bomb stockpile to begin experiments we had most likely carried out five years ago. The best evidence so far that we have made much progress during the past five years on the design of the H-bomb—evidence strongly indicating that it had passed the blueprint stage and was ready for construction—was supplied recently by Lewis L. Strauss, a member of the original Atomic Energy Commission, when he revealed that “the greatest issue of division” (between himself and other members of the AEC) “was whether or not to proceed with the hydrogen bomb, as for some time I had strongly urged to do.” Now, Strauss, who went into the Navy in World War II as a lieutenant commander and rose to be a rear admiral, is a leading financier of wide experience, so it may be taken for granted that if for some time he had “strongly urged” proceeding with the hydrogen bomb, it must have been because he had been assured by the scientific experts that it was feasible. Men of his background and experience do not “strongly urge” the diversion of resources to projects unless they are strongly convinced that the project is both practical and feasible. His words, when read in the light of statements by other members of the AEC, suggest that the division of opinion on this score among the members of the Commission was not over the feasibility of the H-bomb but over the belief that the A-bomb was good enough as long as we were its sole possessors and that we could maintain our advantage for a long time by building more and better A-bombs.