“If you look at the timescales for the development of technology, at some point you invent radio and then you go on the air and then we have a chance of finding you,” he told BBC News.
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“But within a few hundred years of inventing radio – at least if we’re any example – you invent thinking machines; we’re probably going to do that in this century.
“So you’ve invented your successors and only for a few hundred years are you… a ‘biological’ intelligence.”
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