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A heavy-duty dynamo could be replaced by a superconductive dynamo that would almost fit in one's pocket. A thousand-horse-power motor would need to be hardly larger than the shaft it would turn. It would mean ... "Let 'em alone!" snapped Soames. "They couldn't tell you how it was made, even if they could talk English! Give them a chance to learn how to talk! They've had a bad time anyhow."
Among the children's possessions there was a coil of thread-fine copper wire. Somebody had snipped off a bit of it for test, and discovered that the wire was superconductive. A superconductor is a material which has no electrical resistance whatever.
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