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This week marked the 50th anniversary of one of the most ambitious, far-fetched and (at least so far) spectacularly unsuccessful undertakings in the history of science: the Search for Extraterrestrial Intelligence, or SETI project.

And one of its leading lights is now arguing that after five decades of intent listening for radio signals from outer space –- and being rewarded by nothing but fitful static from the rest of the universe – it's time for a different approach.

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