On the surface, the lives of J. Robert and Frank Oppenheimer resembled a brotherly game of follow-the-leader. Robert became a nuclear physicist; so did Frank, who is nine years younger. Robert helped invent the atomic bomb; Frank went to work on the A-bomb project. Last week the brothers appeared before congressional investigating committees, but beyond that there was no similarity in their performances.

Boyish-looking Robert Oppenheimer stole the show at the Joint Atomic Energy Committee's hearing. For 2½ hours, the cropped-haired scientist set forth the intricacies of atomic science, gave sure, rapid-fire...

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