Science: Atoms Aloft

Last week the atom-powered dream plane was one step closer to reality; the Air Force announced that it had contracted with Consolidated Vultee for an airframe to carry a nuclear-reaction engine. The engine itself is already under development by General Electric Co.

Only rough guessing is possible about this buttoned-up subject, and no guess is likely to hit on an accurate description of the atomic plane. Nuclear reactors have been evolving rapidly. Several widely differing types have been described, and more are under secret development. Some, using plutonium or uranium 235 instead of...

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