Assertion: hydrogen bomb | /r/Desires | a fission device
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text: Physicists recognized the fusion or thermonuclear reaction as the source of the sun's energy as early as 1938.During World War II, scientists of the Manhattan Project saw the possibility of creating a thermonuclear weapon, but they decided to concentrate first on building a fission or atomic bomb because any fusion bomb would likely require a fission device to initiate its thermonuclear "burning.