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at 9am next Sunday, six computer programs — "artificial conversational entities" — will answer questions posed by human volunteers at the University of Reading in a bid to become the first recognised "thinking" machine. If any program succeeds, it is likely to be hailed as the most significant breakthrough in artificial intelligence since the IBM supercomputer Deep Blue beat world chess champion Garry Kasparov in 1997. It could also raise profound questions about whether a computer has the potential to be "conscious" — and if humans should have the 'right' to switch it off.