Fewer than one in five people pass this IQ test, thought to be the shortest in the world at only three questions long. The Cognitive Reflection Test has a pass rate of just 17 per cent, leaving the ...

It’s best to solve this week’s puzzle (really, three mini-puzzles) without an introduction. I’ll explain why after you’ve given it a shot. Did you miss last week’s puzzle? Check it out here, and find ...

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