Science: The Man in Tempo 3

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On a bleak Idaho desert, a wayfaring man, if wayfarers were permitted, might stumble on what looks like a scene of mis placed industrialism. A great cloud of steam rises from a pond of hot water, and near by stands a forbidding building of blank-walled concrete. It looks like a powerhouse, but no smoke comes from the six short stacks sticking out of its roof (they are emergency ventilators). The building, nevertheless, is a powerhouse—the first nuclear powerhouse of the Atomic Age.

Inside is a strange, ungainly object: the central half of...