"Would you mind telling me, Doctor," Bob asked ..." how you detect a mental deficiency in somebody who appears completely normal?"

"Nothing is easier," he replied. "You ask him a simple question which everyone should answer with no trouble. If he hesitates, that puts you on the track."

" Well, What sort of question?"

"Well, you might ask him, 'Captain Cook made three trips around the world and died during one of them ，Which one?' "

Bob thought for a moment, and then said with a nervous laugh, "You wouldn't happen to have another example, would you? I must confess I don't know much about history."

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