London: It cannot be solved with a search engine. Specially written algorithms have failed to crack it. Even geeks pooling their considerable resources in internet chat rooms have fallen short. We have had entries that have been within one or two answers of being perfect but no one has quite got there yet. More than a month after the director of UK spy agency GCHQ set a fiendishly difficult "fun" Christmas quiz, not one person has managed to get all the answers right. More than 600,000 people have...
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