Stanislaw Ulam was a mathematician whose work, along with that of Edward Teller, led to the development of the first fusion bomb by the United States. Although Teller claimed that Ulam had little to do with the final design, other contemporaries of the two disagree, and as a result, the staged thermonuclear devices used by the United States in twentieth-century weapon design are referred to as Teller-Ulam designs.

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