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You can watch Fat Man and Little Boy (1989) for free on Kanopy.

Assigned to oversee the development of the atomic bomb, Gen. Leslie Groves is a stern military man determined to have the project go according to plan. He selects J. Robert Oppenheimer as the key scientist on the top-secret operation, but the two men clash fiercely on a number of issues. Despite their frequent conflicts, Groves and Oppenheimer ultimately push ahead with two bomb designs — the bigger "Fat Man" and the more streamlined "Little Boy."

Stifling tension and moral dread permeate every frame as the race to build the atomic bomb pushes human intellect to its breaking point. Paul Newman and Dwight Schultz collide in a volatile clash of military discipline versus scientific conscience.

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