All computations were run twice, and accepted only when the two runs produced duplicate results. “I have now duplicated BOTH RESULTS how will I know which is right assuming one result is correct?” asks an engineer on July 10, 1953. “This now is the 3rd different output,” notes the next log entry. “I know when I’m licked.” Someone running a hydrogen bomb code from 2:09 a.m. to 5:18 a.m. on July 15, 1953, signs off: “if only this machine would be just a little consistent.”
