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J. Robert Oppenheimer working with Albert Einstein.
Albert Einstein and J. Robert Oppenheimer both feared how nuclear weapons would be used in the future.
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Atomic bomb mushroom cloud on the left compared to a much larger hydrogen bomb mushroom cloud on the right.
The Trinity test (left) was made from an atomic bomb whereas Ivy Mike (right) came from a hydrogen bomb.
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White mushroom cloud of the first hydrogen bomb test over the Marshall Islands.
The first hydrogen bomb test, as part of Operation Ivy, detonated over the Marshall Islands in 1952.