High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The Teller Ulam design is the nuclear weapon design concept used in most of the world's nuclear weapons. Colloquially referred to as "the secret of the hydrogen bomb," because it employs hydrogen fusion to generate neutrons, in most applications the bulk of its destructive energy comes from uranium fission, not hydrogen fusion. It is named for its two chief contributors, Hungarian-born physicist Edward Teller and Polish-born mathematician Stanis aw Ulam, who developed it in 1951, for use by the United States.