 During the Manhattan Project, the first practical way to reach these temperatures was created, using an atomic bomb.In 1944, Fermi gave a talk on the physics of fusion in the context of a then-hypothetical hydrogen bomb.However, some thought had already been given to a "controlled" fusion device, and James L. Tuck and Stanislaw Ulam had attempted such using shaped charges driving a metal foil infused with deuterium, although without success.