For a few electrifying days late last month, a spectacular rumor spread among U.S. scientists. British astronomers had detected signals so regular and pulsating so rapidly from four different regions in outer space that they might have been sent by intelligent beings. Last week, when details of the British findings reached the U.S., the possibility that the pulsations had been artificially produced by an advanced civilization seemed remote. But even if the causes were natural, scientists on both sides of the Atlantic were in firm agreement that discovery of the pulsing signals,...
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